I recently took my computer completely apart down to the bare bone so I could paint the case... I put it back together (yes I know what I'm doing, and yes I put it together right), started it up and it won't boot anything, you can hear the hard drive, and the front 1 2 3 4 lights come on. But nothing comes up on the screen. Help me please!

Did you remove the memory, make sure memory is seated properly or remove and reseat

Did you remove wires that connect to the system board and then put back, it is possible that one of those may have been put in backwards which will short the boot process as 1 pin is positive and one is negative - make sure all the wires have Pin 1 next to the #1 on the board or the same direction as pin 1

Reseat your video card if it is not an on board video card

Take any component you may have removed and remove and reseat and make sure all pins connected to the board are in in the right direction