PC goes into standby whenever i type something

Hi everyone,

as the title says i have a pretty big problem. This started happening about 5 days ago and this is my first post in the net about it. I hope you can help me.

So whenever i type something for more than 5-10 seconds my computer goes into standby mode.
This problem happened on windows 7 as well and I tried like every virus tool you can imagine to find out what could cause this. I did find malware and some other junk but that didn't fix the problem so i re-formated my computer with my newly acquired windows8 copy.
But to my luck, the problem persists.

Well then it must be a CPU or a PSU problem right? I cleaned the interior of my PC, checked if the fans are running.
Observed the temperatures with speedfan...everything normal. Then i had my computer sit in bios mode for an hour or so...it didn't shut down.

I'm starting to think that it's actually my keyboard or something going nuts? Is this possible?

The windows 8 event log says that kernel's "energy-management" has initiated the standby.

My system specs:

Intel Core 2 CPU6600 @2.40GHZ
4.00GB RAM
64bit Win8
Geforce 460


Hope someone can help me :/