I have a mac pro 1,1 from 2006 and I am having a start up problem. When I start it up for the first time in the day (usually in the morning) the power light glows and then the computers shuts off, this then repeats. After it has done this about 5-10 times the computer successfully starts up. Once it has started up, it can be shut down and restarted without a problem and all the hardware works. Any suggestions?