Doing computer repair, I fix a wide range of problems. One problem that I see more often are systems that go into sleep/standby mode and cannot come out of it. The cause varies from computer to computer, but the fix is usually a change in the software and/or hardware settings. Here's a couple of ways to fix a computer that goes to sleep/standby and won't wake up.

Your computer uses a standard for power management called Advanced Configuration and Power Interface (ACPI). There are six (6) different 'sleep' states that your computer can use. The following is a portion of the Wikipedia article on ACPI.

The ACPI specification defines the following four Global "Gx" states and six Sleep "Sx" states for an ACPI-compliant computer-system:

• G0 (S0): Working. "Awaymode" is a subset of S0, where monitor is off but background tasks are running.
• G1, Sleeping subdivides into the four states S1 through S4:
• S1: All processor caches are flushed, and the CPU(s) stops executing instructions. Power to the CPU(s) and RAM is maintained; devices that do not indicate they must remain on may be powered down.
• S2: CPU powered off. Dirty cache is flushed to RAM.
• S3: Commonly referred to as Standby, Sleep, or Suspend to RAM (STR). RAM remains powered
• S4: Hibernation or Suspend to Disk. All content of main memory is saved to non-volatile memory such as a hard drive, and is powered down.
• G2 (S5), Soft Off: G2/S5 is almost the same as G3 Mechanical Off, except that the PSU still supplies power, at a minimum, to the power button to allow return to S0. A full reboot is required. No previous content is retained. Other components may remain powered so the computer can "wake" on input from the keyboard, clock, modem, LAN, or USB device.
• G3, Mechanical Off: The computer's power has been totally removed via a mechanical switch (as on the rear of a PSU). The power cord can be removed and the system is safe for disassembly (typically, only the real-time clock continues to run - using its own small battery).

Changing the power management options in the operating system

General power options in Windows 8

Sometimes just changing the software settings in the operating system power options will fix the issue. Access to the power options in Windows can be done thru the Control Panel. Depending on your version and view by settings, you may or may not see a power option link. In that case, look for power options under the hardware category.

Editing advanced power settings in Windows 8

Once there, create a new plan or modify an existing plan, changing the advanced settings as needed.

Advanced power option settings in Windows 8

You can also disable S4 hibernation and make it unavailable quickly and easily using an administrator command prompt.

How to open a Command Prompt with Administrator privileges in Windows Vista and Windows 7

How to open a Command Prompt with Administrator privileges in Windows 8

How to open a Command Prompt with Administrator privileges in Windows 10

How to disable Windows hibernation

Changing power management options in the BIOS

Power management settings in a typical computer BIOS

If changing the operating system's power options does not fix the problem, you can try changing the APCI setting to the computer's Basic Input/Output System (BIOS). To access the BIOS, you will need to do so at the time the computer boots up. When the computer starts up, it usually displays a 'splash' screen with the manufacturer's name and logo. On this screen, you typically see something like 'Press F2 or Del or F10 for setup' (it varies from manufacturer to manufacturer). The 'splash' screen may only appear for a second or two and may take a few reboots to get into the BIOS. Once there, you need to look for Power Management Options. There you will find the different ACPI standby states.

Have you ever wanted to see what programs start up when your computer boots? Or maybe defrag your pagefile? Or how about finding out what files, registry keys, etc., are currently open? You can do all this and more for free with Sysinternals Suite by Mark Russinovicha and from Microsoft.

The Autoruns program from the Sysinternals Suite

Sysinternals Suite is a collection of handy utilities for Windows. I have been using them since Windows 95. From an everyday user to a computer repair technician, there is something here for you. There are currently over seventy utilities included in the Sysinternals Suite.

The Process Explorer program from the Sysinternals Suite

For the everyday user, there is Autoruns, Desktops, and PageDefrag. With Autoruns, you can see what programs are configured to start when your system boots automatically. Desktops allow you to create up to four virtual desktops and switch in between them. And with PageDefrag, you can defragment your pagefile and registry.

The TCPView program from the Sysinternals Suite

For the computer repair technician, there is Process Explorer, Process Monitor, and TCPView. With Process Explorer, you can see what files and folders a program has open. Process Monitor is a real-time monitoring tool that provides detailed information (PID's, path, etc.) for files, registry, and processes. And TCPView gives you a detailed listing of all network endpoints, local and remote, with addresses and port numbers.

For more information on Sysinternals Suite and all of the free utilities included, follow the links below.

Sysinternals Suite

Sysinternals Utilities Index

When it comes to computer repair, you have to a detective of sorts. And once in a while, I come across a really good mystery. I recently got an HP M7360N in the shop that would randomly freeze-up in Windows XP when you moved the mouse. It would run perfectly fine in Safe Mode. Maybe a bad driver?

A check of the event logs yields absolutely nothing, not a single error. I check Device Manager and find the hard drive controller listed under the Unknown category, even though it is correctly identified as an Intel controller. I uninstall it inside Device Manager and then scan for hardware changes. The hard drive controller reinstalls back into the Unknown category.

The system is still freezing up randomly when the mouse is moved. I tried a PS2 and USB mouse and got the same results with both. I disable all non-essential drivers and reboot with no change. I download the original and latest drivers for the system, trying all with no luck. Maybe a corrupt installation?

I create an image of the hard drive and then wipe it clean. Using the supplied recovery disks, I proceed to re-install the operating system and recovery partition. The system froze-up three times during reinstallation. But this time, the hard drive controller is under the correct category, IDE ATA/ATAPI controllers. It's starting to look like a hardware issue.

I run a few DOS-based utilities to test the memory, hard drive, etc. with no luck. I even try the HP recovery diagnostics. Every test I run tells me that there is nothing wrong with the hardware. Using the keyboard only in Windows, I can install another utility to test all of the motherboard components. I allow it to run for six hours, and the system passes every test.

The BIOS is the next place I look and find it's a few versions older than what is currently available for download. I download and install the latest BIOS version, and it still keeps freezing up randomly when the mouse is moved. I start searching the internet for clues.

After a few different search queries, I come across an article at Badcaps.net discussing symptoms of capacitor failure on motherboards, one being 'system randomly and frequently freezes'. I check the motherboard thoroughly and find no capacitors that look bad. I start checking the expansion (add-in) cards, and all at once, the mystery was solved.

There on the graphics card was a bank of capacitors that the tops were swollen.

Top view of the graphics card showing the difference between good and bad capacitors.

Side view of the graphics card showing the difference between a good and a bad capacitor.

The movement of the mouse on the screen was causing the graphics card to freeze-up. I re-assembled the system with a new graphics card, and the issue was gone. Another computer repair mystery was solved.

This article shows how to use the Eject Pin Hole to manually eject the tray on your computer's CD / DVD drive. There will be times when you need to open the tray on your computers CD / DVD drive when the system is powered off.

• You need to boot your computer using the CD / DVD drive
• You need to retrieve a disk without starting up the computer

Caution: Turn off power to the system before manually ejecting a disk.

All CD / DVD drives have an Eject Pin Hole. The only thing we need is a paper clip to use it (I am using a #1 size for this article).

All we have to do is bend it at the first curve 180 degrees (straitening it out). Then take the second curve and bend it 90 degrees. Now we need to locate the Eject Pin Hole.

Desktop CD / DVD drives:
Gently insert the modified paper clip into the Eject Pin Hole until you feel it make contact with the gear underneath the tray. Firmly pressing inward, you will notice the tray to start to move out. Press inward until you have enough room to get your finger under the tray and then pull it out the rest of the way. If you can only get a small portion of the tray out, you can use the other end of the paper clip to gently pry open the tray enough to get your finger under it. Once done, gently push back the tray to the closed position. It will close firmly when the system is powered up.

Laptop - Notebook CD / DVD drives:
The trays on laptops/notebooks are spring-loaded, so all that is needed is to release the locking mechanism. You do not have to insert the paper clip as far as with a desktop CD / DVD drive, as you are not connecting to the gearing under the tray. Gently insert the paper clip into the Eject Pin Hole. Once you feel it make contact, gently push in, and the tray will eject immediately. Once done, gently push the tray back inward until it locks back into place.

You can help solve some computer problems and improve your computer's performance by making sure that your hard disk has no errors.

Click on the Start button.

Click on Computer.

Right-click the hard disk drive that you want to check, and then click Properties.

Click the Tools tab, and then, under Error-checking, click Check Now. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

To automatically repair problems with files and folders that the scan detects, select Automatically fix file system errors. Otherwise, the disk check will report problems but not fix them.

To perform a thorough disk check, select Scan for and attempt recovery of bad sectors. This scan attempts to find and repair physical errors on the hard disk itself, and it can take much longer to complete.

To check for both file errors and physical errors, select both Automatically fix file system errors and Scan for and attempt recovery of bad sectors.

Click Start.

Depending upon the size of your hard disk, this may take several minutes. For the best results, please don't use your computer for any other tasks while it's checking for errors.

Note:
If you select Automatically fix file system errors for a disk in use (for example, the partition that contains Windows), you'll be prompted to reschedule the disk check for the next time you restart your computer.