reseat the following (and yes, I know you didn't do anything with some of these, but reseat and check the pins anyways... you may of bumped them). Reseat the processor, memory and vid card. Make sure the vid card is firmly in place. should be nothing of the connetors or very little showing. most have a retention on them, so listen for a click
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.