Answer for:

Why is my new graphics card causing my computer to reboot?

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Does it get in to windows? Does it reboot when a graphic mode changes?

On the PSU:
Not all PSU are created equal. They all put out different amps on various rails. A cheap 350W PSU might fail to run a high-end graphics card where a top of the line 300W might do just fine. I would never use a PSU rated this low. I have a 750W and I would say the minimum for gaming is 500w.

Before you replace the PSU, pull out the video card. Update the bios. Uninstall the previous video card drivers. Turn off the system. Install the new card. Turn it back on.