Done - went to my friend (he lives next to me) and asked if i could borrow his computer for a few minutes.. the graphiccard worked well inthere!
Well, this is good news. Just means 1 more thing this working right.
From what you've done already and just know, I really cant think of anything else other than the Motherboard or the PSU.
last question, for the Power supply, What brand is it, model number, wattage and (if you remember) how old is it?
The PSU may just might not be able to give the electricity to the system like it used to if it's old.