Mac Pro 2008 won't boot past spinning wheel

I have a Mac Pro from late 2008 which turns on, makes the startup sound, and remains on the spinning wheel for about 30 seconds before the wheel freezes. I have Windows 8 installed on another internal drive and I can't boot past their version of the spinning wheel, either. I've tried booting off of the install disc (Snow Leopard, which is what the machine is running) and off of a USB stick with a Snow Leopard .dmg on it, neither of which have worked.
I've done all the steps to fix a drive error, so I don't think it's that. I've read that it could be a graphics card error; has anyone else experienced trouble with theirs? Mine was a GeForce 7300, if I remember correctly. Thanks in advance.

It certainly sounds like a graphics card problem.
User Tip: Mac Pro silver tower (2006-2012) Replacement Graphics cards

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    Message was edited by: Richard Williams Jr

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