Computer turning on by itself

[bcr1231]

I got a pretty weird one for you guys...

so last night... on Halloween night, i was on chrome watching some videos on YouTube, all of a sudden internet starting crapping it self. thought it might be router so i reset it and still was extremely slow. (about 3 minutes to open YouTube). wanted to see if it was possibly just an issue with the ISP so i got on my ipad and internet was fast as it always was. So internet speed slow was only on my PC. so shut down (at about 11:00 on Halloween night!!!!). and put the task of fixing the issue for tomorrow. when two minutes later it rebooted up all by itself. at this point i was scared as hell. so i logged in and checked for any errors and then checked internet speed again and was still slow. also ran an AVG virus scan and a antimalware scan that both came up clean. so i shut down and again, this time about 30 sec later, booted up by itself. being tired as hell i just shut down and switched off power supply. the next morning i got on and looked through some forums and there was not much there, besides doing virus scan and resetting cmos. so being impatient i did a restore point. this did fix internet speed problem but dident fix self reboots.

i should also add i recently installed a new additional hard drive and a fan (leaving me to think that it might be a power-supply issue even know i have a 600w atm

specs

amd 8120 eight-core
seagate barracuda 500g
WD 1TB additional HD
cooler master 600w PSU
970 UD3 gigabyte mobo
4x2 hyperblu ram

 

[SchizTech]

In the BIOS, is there an option something like "boot from LAN" that is enabled? If so, disable it.

 

[J_E_D_70]

That's usually caused by an angry ghost who died playing too many video games and is trying for one more fix.

 

[SchizTech]

Sorry, that should be "start on LAN" or "wake on LAN" not "boot on LAN"

 

[CompGee]

I think a ghost has taken over your computer.

 

[Uberragen21]

It sounds like you put you PC to sleep rather than powering it off. A PC that is powered off cannot just turn on; however, when it's in sleep mode it can turn on with wake timers or in power settings on the device manager.

To check the wake settings, go into Control Panel > Device Manager. Go through each device, select properties and select the power management tab and make sure "allow this device to wake the computer" is unchecked. Go through the list, but keep in mind that usually the network adapter is responsible for waking a sleeping PC.

Also check in the Task Scheduler to see if any tasks have "Run whether user is logged on or not". If this is checked on any task and you are not using a password on your account, then any program can create a task that wakes your PC to run. Malware often does this, but so does legit programs that you may not expect.