You Have Not Connected The Power Extension Cable To Your Radeon 9800 Video Card

[mastag]

That is what i see when I try to boot up my PC. All the cables are connected. It boots up like normal some times, but most of the time i get that error message. This started about 2 days ago. Is my card dying? D:

 

[Stigmata]

Could be your PSU dying. My guess is either the power port on your card is damaged, or your PSU/GPU-specific power cable is damaged causing lower power output.

 

[Asus]

Unplug the power cord plugged in at the end of your card. Make sure the wires are all even in the molex plug. Plug it back into your card.