PC won't boot?

[Lurno]

Greetings. I'm experiencing a problem with a PC that worked OK up until now. I opened it to see if a new motherboard that I had purchased would fit (Not removing it, just comparing the size, I only removed a cover from the case) and when I cover it again, it won't boot... Not even into bios. Is the board dead? This seems too random to be true, but not a big loss since I was going to replace it anyways... But this is the second time something like this happens to me... Is this normal? I am starting to suspect that the power supply has something to do with this, but I can't detect burning smell or any sound from it (other than the fan).

 

[krone6]

Was it plugged in when youtried this? Did you ground yourself and use an antistatic wrist strap? Did the motherboard you were holding touch anything metal?

 

[Chipeater]

I've accidentally hit the switch on the power supply before while handling a computer case. It had me scratching my head for a minute...let's see...cord plugged into mains power outlet...other end of the power cord plugged into power supply...OH!, darn it, I must have switched the power supply off by accident!

 

[krone6]

I've accidentally hit the switch on the power supply before while handling a computer case. It had me scratching my head for a minute...let's see...cord plugged into mains power outlet...other end of the power cord plugged into power supply...OH!, darn it, I must have switched the power supply off by accident!

Oh yea, that too. Same as when my video card wouldn't start.. It wasn't plugged in!

 

[Lurno]

Yes, it was plugged in, however, now that you mention grounding... I never ground myself... But I didn't touch anything metallic, nor did the motherboard... I think... But if this is what happened, then the new motherboard is dead as well and the other parts have not even arrived yet... I am very screwed... Very, very screwed. Wait... Is screwed considered a vulgar term? Sorry if it is...
EDIT:Wow, 2 more replies while I typed this. Thanks for the help!
Edit 2: I checked and the power supply lacks switches.

 

[krone6]

Is the problem still around?

 

[Lurno]

Is the problem still around?

 

[Lurno]

The older motherboard mysteriously came back to life the moment i was going to replace it. The new processor arrived, but not the ram... yet... I left the motherboard alone for a bit and one of my family members pulled a capacitor off... When I connect it, I expect to see at least spinning fans... But nothing seems to get power. Does this mean that the motherboard is 100% dead or will it work if i just place it back on the pins without soldering and when I get the ram?
EDIT: The ram arrived, it didn't work...