CPU won't boot, only power led lights up

I am having trouble trying to get my pc pass the bios screen. Every time when I hit the power button, everything are running but I just couldn't get into the bios screen. Occasionally when I get pass bios, my clock time will change itself.
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More about boot power lights
  1. Here's a good starting place, go through each step http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems
    Good luck
  2. Mine is not a newly built system. So I don't really think is the connection problem.
  3. Ahh, what are the system specs and what was the last successful thing done on/with computer before this issue started. If this is a Dell or HP machine, I will suggest replacing the CMOS battery since (for reasons still beyond my knowledge) they will not boot without a 'good' CMOS battery.
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