BSOD with Various Error Messages

[RedSpider]

Good day good people. Approximately 3 days ago, I encountered my very first BSOD. It has happened a dozen or so times now, each time with different messages - something about IRQL, others about memory management, executing a non-executable along with just about everything else.
In the past month, all I've installed onto my PC are a new webcam and a copy of NOD32. I uninstalled these so as to rule out dodgy drivers/software.
I've even gone to the extent of formatting my system and re-installing windows 7 but I still encountered blue screen evn though I hadn't yet installed any new hard/software since the reinstall.
I've ran a memory diagnostic and the memory checks out ok.
I'm also encountering problems where the keyboard sometimes won't work.
Othertimes, my computer will just freeze up on me, leaving me with no choice but to just unplug it.
Another issue is that after I plug it back in again, the computer won't switch on at all unless i leave it for 5 - 10 minutes unplugged.
It's not overheating, theres plenty of room round the back and either side and neither does it feel excessively warm.
I've just downloaded the latest bios updates from Acer but have not yet installed it.
I'm thinking Bios or PSU, ubergeeks amongst us might think different so, please, input away my little soldiers.

All advice / information appreciated and many thanks in advance

[dasteph]

i have had a pc freeze constantly some time ago tried everything, removed menory, disconnected hardware cleaned the pc thinking it was running hot, turned out to be the psu causing the problems one of the votages kept failing.

[mbsobrinho]

The message that is appearing is code like this?
BCCode: d1
BCP1: 47654E33
BCP2: 00000002
...
As in the example BCCode: d1, is usually caused by driver or some software that is running, I've seen in some cases be the antivirus.

Can you post the error codes?

[RedSpider]

The message that is appearing is code like this?
BCCode: d1
BCP1: 47654E33
BCP2: 00000002
...
As in the example BCCode: d1, is usually caused by driver or some software that is running, I've seen in some cases be the antivirus.

Can you post the error codes?

first of all, i gave up writing down the error codes because, as i say, its happened many many times all with different error codes.
i would like to believe i've ruled out software or driver issues as it has also happened after i formatted my drive and re-installed windows, before i had installed and software. and also in safe mode

[rwl408]

Hard drive

Have you tried a 2nd hard drive? If not, give it a shot.

[Dark0]

By the description it sounds like the most probable things would be either motherboard (visually check for any bulged capacitors, although it doesn't mean it's OK if none of them appear bulged), PSU or RAM.

Unfortunately, it could also be pretty much anything else. The only reliable way would be to swap components with the known good ones (from a working computer).

[RedSpider]

The answer was dust. All clean and dandy now. The simplest things eh?

it was not the dust. it was fine for a little while but i discovered the problem to be the motherboard.