Mac Pro stuck on white screen

Firstly, some details to save questions later:
Mac Pro 2006
Snow Leopard (latest update)
After using my Mac Pro as normal last night (no issues whatsoever), I go to boot it up today to find it is stuck on the white screen just after the Apple logo.
My first thought was that my OS drive had kicked the bucket and I'd need to resintall the OS. No biggie. So I attempt to boot from disk, holding "C" whilst booting - the same issue. Goes from the Apple logo to blank white screen.
So I try to boot from disk by holding Alt whilst loading to select drive and boot from the disk there - this time we just get stuck on a blue screen.
Strangely enough, the original OS drive DOES show in the list of available drives.
I have also tried booting in safe mode to no avail.
I've heard talk of video cards failing and causing issues similar to this, which could make sense considering in the last 6 months or so, my mac has had an awful habit of "forgetting" it's resolution, forcing me to restart it.
Can anyone else offer any suggestions?
I'd much rather avoid having to get a new video card unless this is 100% the fault with the mac.

The simplest thing your Mac can do is Alt/Option boot, because all the code for that function is in ROM. In that case, there is no Apple logo that appears, and the screen only goes to the list of available possibly-bootable Volumes, arrayed across the screen. If you are seeing the Apple logo (which is loaded off a Drive) you have not succeeded in Alt/Option booting.
Sometimes having the keyboard plugged into a Display or other Hub can cause the "snag keys" to be missed at Startup, and be ineffective.
If something interferes with your ability to Alt/Option boot, it is most likely to be the contents of your Hard Drive. If desperate, pull out the Boot drive and see if you can Alt/Option boot with only the DVD in the drive.

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