Computer turns off a second or so after pressing the start button. Sometimes it turns itself back on and of a few times. If I persevere it usually will finally start but then says "overclocking failed press F1 to enter BIOS". I enter the BIOS and then exit without making changes and it boots OK. Once booted it is stable with no problems until the next cold boot (restart or reset boot up with no problems). I am pretty sure the BIOS settings that I can alter are OK and I have replaced the CMOS battery which did not help. I have an ASUS motherboard (P4P800) with Interl P4 3.2GHz processor and 1 Gb RAM. This is a recent problem, computer has worked fine for 3 years. Windows XP. Any help appreciated.