My MacPro 1,1 will only boot if I resert PRAM each time, and then that does not work each time. When it does boot all is fine. Any idea before I head off to genius bar.

To boot my MacPro now, I have to go thru the reset Pram. Doesn't work each time. I usually don't turn my machine off. Booting in Safe mode does not work...when it doesn't boot I get only a gray screen, no icons in the screen like bad disk etc. I have replaced the battery. My professor son tells me to setup a new drive internally and install a new system and see if the new OS works. I have 3 internal drives with all data on bays 3 and 4... Bay 1 is the system drive with apps only. I'm 70 miles from the closest Apple store and thought I would ask tonight before driving in.

Replacing the PRAM ("backup") battery on the machine may be needed.  Here's how, go to page 50 of the user manual:
http://manuals.info.apple.com/en_US/Mac_Pro_User_Guide.pdf

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