Well i didn't do that step again, as you said it drains the psu.
I tried another way of testing the PSU. I removed all wires attached which were coming from the psu. Next i took the 20 pin cable (which was unplugged) and stuck a paper clip into the pin in which the green wire was attached, i then attached the other end in one of the black wires next to it. Then i attached just the cd rom, and plugged in the power cable. The light on the cd rom turned on, so now i'm assuming there is nothing wrong with the PSU. (but the cd rom wouldnt open, not sure if that has anything to do with it.)
Next i took out the paper clip, and reattached everything back. Keep in mind that no hardware was attached. I thought to just power it up again (with everything in normal) just for the heck of it. Now i just plugged the power cable in, (no monitor/mouse/keyboard/etc) and it power up normally (because the fan wasn't spinning loudly)
I then quickly attached the monitor cable while it was booting and i had display, it booted up properly.
Then i attached the mouse, but there was no power to the mouse. Do you think maybe the mouse/keyboard socket is the culprit here? Because this also happend back when i first attached the new video card.
So for writing so much lol, i really appreciate your help