I got sort of a problem with my new Radeon 4890 card. Got it today and when I try to boot the computer, the monitor just turns blank and the computer wont boot. All I get is "check signal cable". It runs perfectly fine when I chuck my old graphics card (GeForce 8500 GT) in and go with the same cables (VGA with a VGA to DVI-I adapter). What happens is that the new Radeon just goes to max fan speed, making a hell-of-a-lot of noise and then nothing. Lights on the Radeon 4890 are on and it seem to be working properly. I connected my power supply (Corsair TX650w) to the Radeon 4890, but the Radeon got 2 different slots (one 2x3 pins and one 2x4 pins) and as the power supply I have got some pins which says PCI-E on it, and matched the 2x3 slot I figured that was the way to go. Not sure if it's the right one though so please feel free to correct me.
So I really don't know what the problem is. As I mentioned, I don't even get it to boot far enough to get to the bios. The GPU fan just goes nuts and nothing happens. I tried to problemshoot as much as I could. I removed 1 of my 2 RAM to no avail, also reset my bios to default (not done the clean sweep you do on the motherboard though, as I have no idea how to do it), checked with and without my VGA to DVI-I adapter, my HDMI to DVI-I adapter etc etc. I'm unsure if the cables are the problem though, as I'm running the CPU now with my old GPU with the VGA to DVI-I adapter and it works fine.
So please, if anybody had any similar problem, or any idea, please let me know. I'm sorry if my description of the problem is a bit messy, but if anything is unclear, just ask and I'll try to explain it in more transparent terms. Thanks.