Mac Pro won't start up- HELP please.

I had a white screen a month ago .After buying a new harddisk and reistalling the whole system 10.6.5 and reistalling all programs from ground zero, I had the MPro working nearly for 2 weeks. But Suddenly today It got a frozen screem with a black curtain. I disconected all the external devices and after starting up I got a loading bar and then the spining wheel but it doesn't turn on.
Is this a sign that I need to change the motherboard?

You may be experiencing a Kernel Panic as seen and described in Apple doc.#106227. If not, disregard.
Bad or incompatible RAM is the most common cause of KP's. It could just need to be reset……. to make sure there's a good connection.
Try pulling any added RAM, especially if it's not OWC, Crucial or Kingston. Then run it with original RAM. Ground yourself while doing so. Keep in mind a bad stick of RAM can cause directory corruption, so Repair Disk after pulling the RAM. If it still does KP's, try removing the original RAM and running on two sticks of the added RAM.
Here's a great site for Resolving Kernel Panics. Please do all the steps in order, even if you don't think you need to do a certain step.
Here's a great MacFixIt article.
 Good Luck! DALE

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