My 05 cpq presario v6000 laptop intermittently has an identical boot up problem when it powers up for exactly 22 seconds then shuts off, comes right back on, then cycles on and off again exactly 22 seconds again and again till I shut it off. Sometimes it will boot up properly a few hours later, a day later, and the longest 2 weeks later and run fine till it happens again. ????????? Thanks ahead of time for your input. Sincerely yours, Puzzled.