I changed graphics card and now PC is dead

[leswhitham]

Let me explain, My pc (windows 7 ultimate 64bit quad core) home build has been running relatively perfectly for a while, but I decided on an upgraded graphics card - HD4890 rather than the older HD4850. Anyways I got it on eBay as a used item. So it arrived today and I installed it as I've done loads of times before, attached all the connectors and booted up with no problems. Although the resolution had changed to a very low setting (which I've seen on changing other graphics cards). I soon realised I had forgotten to plug in the keyboard so did that and with no response from the keyboard, I rebooted. Although I'd left the room for a few minutes when I got back the pc was off. I tried switching it back on but without power to the tower. The green light on the mobo (Asus P5N32-E) was lit for a while then went out. So it doesn't power up, it seems dead to the world. Even when I replace my old graphics card there is nothing. I've read a few other threads asking to try to boot up with only the cpu and memory (I have corsair 4x1gb) but I get nothing at the power button. The psu is a 650w Alphapower unit and it's only about 8 months old. I've got a sneaky suspicion it's this though. But I don't understand why it would blow after changing the graphics card. Any ideas will be much appreciated

 

[klepto12]

really depends on weather the psu can output enough power for that card never heard of that brand probably the psu IMO.