Video problems

[Scintir]

I just installed my new AMD Phenom X4 9850. After the first boot it worked fine. I went through to install the catalyst 8.9 drivers for my HD 4870 because it appeared that there was a problem with one part of the driver failing. After restarting I got a corruption error for Vista. After rebooting it then stopped displaying video. I went through and screwed around (made sure it was set properly into the slot, make sure power is set, reset CMOS) until I just swapped out the graphics. I put in one of my older ATI cards and it booted up with the windows error. I restarted and it went away. Now I can run with the older ATI card, but when I put in my HD 4870, it just doesn't provide video. Another thing is when the computer first starts, the three lights (first, third and fourth (starting from the outside going in)) flash for a little bit. After that there are no light indications. I don't believe that the HD 4870 would have just died from that, but who knows. I would like to know if anyone has any ideas as to what might have happened to my graphics card and a possible way to fix it.

System Specs:
MSI K9A2 platinum
AMD Phenom X4 9850
2 X 2GB Mushkin DDR2 800MHz
ATI Radeon HD 4870
750W Power Supply
2 X 250GB WD HDD SATA 3.0GBs (RAID stripe).