Mac Pro 1,1 No Longer Restarts

My 2006 Mac Pro (OSX 10.7.5) no longer wants to restart. Currently, I have no problems shutting it down and then starting it up using the Power Button, but when I issue the Restart command (from the Apple Menu or software installers) the screen goes black (as it does in a normal restart) but just "clicks" repeatedly, forcing me to use the power button to shut down then start the machine. Does this sound like the PSU may be on it's way out?

Besides using Disk Utility in Recovery Mode, do you have a bootable backup?
You did a fresh install from DVD? then you must be using 10.6.8 as well as Lion?
Did you make a Lion installer also?
Upgrade the graphic card to 5770?
Have external devices?
Anytime you force shutdown, consider doing a SAFE BOOT on the next startup and that some files along with the directory (DU only fixes some directory problem) as well.
Mine is also 1,1 and no noises, and I only really had to use SMC reset when there were definite hardware issues related to bad USB devices, and from a Sonnet Tempo SSD PCIe. Even had trouble using drive bay #3 for a long time and not sure why but when I fixed other USB problems it went away. USB can be a ghost in the machine.
And it really does help to always have your system on a good UPS.

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