Fitful sleep mode - why?

May 1, 2014 at 07:26:45
Specs: Windows Vista
HP xw4600 Workstation (acquired used), 4Gb RAM, Intel Core2 duo core CPU.
Win Vista Business SP2, 64-bit OS, all relevant updates installed.

When this computer is in sleep mode, it seemingly goes through a hardware reboot every 2min 20sec (+/- a second or so). The power light on the front panel goes off, all the fans shut off (including the power supply fan), and the box is utterly silent for 3-4 seconds with the power light blinking on / off slowly, and then the power light comes back on, fans start back up, DVD drive light comes on as the drive is being pinged, and so on, then it's right back to sleep mode. The monitor does not wake up during any of this activity.

Software-wise though, it's as if nothing happened. When I wake the computer, Windows is still up and running with the desktop exactly as I left it. The software did not restart in any way.

Any ideas what is going on here? I've not found any reference to this in my online searches so I assume it's not a prevalent prob with the OS or with the box. Is this constant 'restart' shortening the life of any components? Thanks for your input

Edit to add: Numerous anti-virus scans and anti-malware scans with different products have returned a clean bill of health.

message edited by dabuttery

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May 1, 2014 at 08:38:06
Possibly a faulty PSU, and yes, constant restarts is not good for the hardware.

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May 1, 2014 at 09:44:22
Are you sure the computer is actually going through a hardware reboot?

Usually some noises created during that process.

Generally speaking if that were the case, the computer would NOT return to the same exact state as it was in.

I suspect that something is interrupting the mode it was in.

To check this isn't the case, I suggest you disable ALL suspend modes and test.

There are many reasons why the power saving mode can change. Software calling to run, wake on LAN, etc. On the opposite side of those would be suspending hardware or a screen saver kicking in.

See the Google search link below for more on Power saving options.

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May 2, 2014 at 13:08:18
From a Command Prompt, you can run
powercfg -waketimers
to see if software has requested to wake your PC. You can also just disable the DVD drive's ability to wake your PC. Might as well do your network cards as well while you're in Device Manager.

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May 2, 2014 at 21:20:35
Sometimes hard drive power down causes a problem with sleep/hybrid sleep so try setting hard drive to 'Never' and let sleep mode power down the hard drive when its ready.

You can also disable LAN and other ports from waking the system from BIOS settings so there is no chance that they will be able to.

You have to be a little bit crazy to keep you from going insane.

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