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Computer turns itself on

X

xcelr8

Member
This morning i awoke to my computer being on, when i had shut it down the night before. I installed no software wittingly, but did download some files last night. I have tried using both adaware and spybot as well as running nav scans, removing anything suspicious. The computer continued to turn itself back on within an hour of shutting down. I also tried a system restore with windows and reflashing the bios. The problem persists, wake-on fxns are disabled. Does anybody have any idea what might be causing this? As a last resort i will reformat, hoping that fixes everything, but i hope i won't need to. Thanks
 
Try unplugging things like the phone line, the ethernet, the printer, etc. Turn the PC off completely and disconnect everything but video and power (yes, including keyboard and mouse) over night. Report to us your findings. 🙂

On second thought, you say it turns on after one hour? Try connecting one device at a time, a few hours apart?
 
Check your BIOS -- there are various Wake On... settings that could be doing it. Make sure they're all disabled.
 
It might have in BIOS some option to autostart if the power returns. Did you had a power outage in the night (or a brownout might have been enough)
Those Wake-On-*** must have special wires from the ethernet card to the mainboard, from the modem to mainboard and so on...
But if you have hmm... integrated network... hmmm

Calin
 
Ok, I turned the computer off last night and unplugged everything from the back of the case. I awoke this morning to it having turned on again. I turned it off and even unplugged the harddrive cables and it came on again within another hour. All wake on functions are off. I have a modem and videocard in the board and that is all. There have been no power outages recently. I have tried flashing the bios to no avail, are there any other suggestions? Since it happened with the harddrives unplugged formatting won't even make a difference and I have no clue what is causint this. Also, i'm not connected to a network at all either, but i do have theh NF7-S built in ethernet controller enabled. I'm open to any more suggestions. Thank you
 
Task Scheduler? I believe it can wake the computer up on ACPI systems.

Flash the BIOS? - sorry missed that you already tried that.

Have you checked for a newer BIOS?

You could even try flashing to the same version if there isn't a newer one to see if that helps.
 
Diconnect the power switch from the motherboard. It may be as simple as the switch has gone bad and is completing the circuit. If not, I'd be looking at the motherboard as the culprit.
 
I'm not sure as of yet, but I think I may have the problem licked (keeping my fingers crossed though). After clearing the cmos to no avail and checking all bios options I flashed it using the windows based utility that abit offers. This didn't change anything, however, I tried again as LTC8K6 suggested, but using dos this time and it appears to have fixed the problem.
 
Get yourself a UPS - and that will provide a a lot of benefits. But, if you switch it off, there is now way the computer can get power. Same for a plug box.
 
Originally posted by: corky-g
Get yourself a UPS - and that will provide a a lot of benefits. But, if you switch it off, there is now way the computer can get power. Same for a plug box.
Click to expand...

There are mainboards that have a led of "powered" on them (to anounce you that they are powered). The led is lighting when the computer is stopped, and will darken only if you disconnect it from the power outlet.
The ATX switching power supplies (unlike the AT ones) give power to the mainboard even in "off" state. This is why you can shortcircuit two pins on the mainboard and start the computer (yes, the pins connected to the power switch)

Calin
 
Update: I spoke to soon about the problem subsiding. I flashed the bios and reinstalled windows, everthing was fine for a night and the computer then started to turn itself on again. I had thought it was a bios problem, but when i leave the harddrive unplugged it doesn't start up on it's own. I have run full norton antivirus scans with the newest definitions as well as adaware and spybot, and still they come up with nothing. Is there some way that this got into my boot record to trigger the start up? I have a 160gb drive partitioned into 3 drives, and have formatted C: twice now, full formats, to no avail. The drive is almost full and I have no way of backing up all that data to do a full format of the entire drive. Is there someway to check or recreate the master boot record without destroying my partition information?
 
I repeat - it the computer A/C cord is connected to a UPS or a plug box, and they are off - it matters not what anyelse is - the machine cannot turn on. No juice - no "On." 🙂
 
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