After replugging, Will Not Boot, or POST. Monitor no input signal.

This started when my monitor began to have scribbly swiggly lines and then windows would crash, followed with a BSOD (attempt to reset the display driver and recover from timeout failed) with a 0x00000116 stop code, and nvlddmkm.sys.

Every time I logged to windows, this would happen again within 10-20 minutes.
I tried updating my nvidia driver, no luck. Tried reverting back to an older nvidia driver, no luck. Same thing happens.

Boots into safe mode, no problem, but eventually even safe mode began showing swiggly lines in the background, but it doesn’t crash, and I could still navigate everything fine. So I backed up everything there. Due to problems of getting the safe mode prompt to come up, I ended up making it boot to safe mode by default from the control panels boot option.

I decided to disconnect and reconnect my video card, and also ram, dust out the insides, reconnecting everything to see if it helps. And install display driver uninstaller if I was able to boot back in to wipe out any residual drivers if that might be the cause.

However, after I reconnecting everything, the computer now won’t even boot or POST. It doesn’t beep when I turn it on. It powers on fine, all the fans spin. PSU, CPU and video card fan works. My monitor has no input signal and goes to standby. Mouse and keyboard connected. Tested my monitor in two other computers, it works fine. Temperature indicator on my case are all normal.

Any ideas? Thanks in advance.

OS: Windows 7 Professional X64
Mobo: Asus P5k-SE deluxe
CPU: Intel E8500, 3.16ghz not overclocked.
GPU: Nvidia Geforce 9800gt, 512mb DDR3, on PCI 2.0 X16, not overclocked.
PSU: Corsair 500W
Ram: 256mb X 2 DDR2 (forgot what it is). But are identical.