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Weird One: PC Powering Up On It's Own

by PackRuss / June 7, 2007 6:51 AM PDT

I have a strange problem to report to see if anyone has heard this before. I have a desktop systems with WIN XP, that recently, just started booting up on it's own. Just yesterday I watched it shut down normally severla times, only to find it had booted up minutes later upon going back in the room. I not sure if this may be a power supply issue, or some crazy trojan trying to run my PC in zombie mode? Has anyone seen anything similar?

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Well known causes.
by R. Proffitt Forum moderator / June 7, 2007 7:00 AM PDT

The BIOS settings of power up are WOK and WOL. Wake On Lan (WOL) and Wake on Keyboard (WOK). There are others as well.


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Remote power-ON via the bios
by Willy / June 7, 2007 10:12 PM PDT

If this never happened before then it could be a possible power issue, though the bios could be at fault as well. As explained by Robert, there are bios setting that need to be checked, disable them. If the system boots when the phone rings that a sure sign of the bios setting. I have found poor kybds. do this, especially if dirty or well used, because of the "power-ON" hot key is worn or sticky.

The mtrbd. and power supply are so closely aligned it's hard to pin-point it if they're at fault. The psu if flaky, needs to be replaced. If the mtrbd. due to weak power-ON ckt. is flaky, you have to replace mtrbd., unless capable of soldering, etc.. I would check the power-sw.(ON/OFF) harness to see if its OK, reseat it regardless.
Make sure you are powering-OFF and not using some hibernate or sleep mode. Next time, after normal power-OFF, pull the AC cord. Then restart next time and just see if the problem disappears. If problem reappears, use system on power strip, then after usual shutdown, flip the sw. to remove AC.

tada -----Willy Happy

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by PackRuss / June 8, 2007 3:31 AM PDT

Thanks, for the suggestions. I will have some time to check some things this weekend and let you know what I find.

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Happened To Me
by wexmary / June 8, 2007 6:55 PM PDT
In reply to: Thanks

Check all connections, for me it was a connection from sound card to PC that was loose. I tightened it (a Dell) and problem went away.

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New (Vista) PC
by Zouch / June 8, 2007 12:22 PM PDT


2.Make sure your restore disk (if supplied) is readable. If not supplied, read the manual and find out how to create one.

3. Install solid Firewall, Anti-virus and Anti-spyware systems.

4. Now you can go online and use MS Update to download and install all outstanding patches (yes, there are some for Vista).

5. Have Fun and enjoy your new machine!

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by OMIGHTY1 / June 8, 2007 9:37 PM PDT

That IS weird. If I were you I would
1.) Download 1 or 2 really good anti-badstuff (gets all malware) programs
2.) Restart after scanning
3.) Update Windows, if possible
4.) Defrag
This should get your computer faster and out of this problem. If it only gos faster, but the problem persists, do that bios thing the others were talking about.

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power supply unit overheat
by bossfan / June 9, 2007 1:59 AM PDT

Had a similar problem with mother-in-laws PC. Intermittently (but got more frequent as time went on) PC would "appear" to shut down then restart shortly after. I say "appear" to shut down, as the power on/off button on the front is lit by LED when turned on. Whenever PC would "appear" to shut down, the power LED remained illuminated.

Finally traced the problem to a fault in the power supply unit; it was overheating and would shut down, then once sufficiently cooled it turned power back on to the PC and a reboot.


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Weird One: PC Powering Up On It's Own
by uncapher / June 11, 2007 1:02 AM PDT

One of my systems has had this problem for a couple of months now. I tried Bob's suggestion for checking the Bios, and it turned out that the setting for my Power On/Off switche had become disabled, as had my ACPI setting. Don't know how, but all is OK now.

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