My HP nx6125 laptop has an intermittent problem at startup which seems to be getting worse.
I turn it on, the DVD drive spins up, then the HDD, then it powers off and restarts. This cycle takes about 2 secs, and it goes through it about 10 times before it gives up and the fan just stays on. There is no display or beeps, ie. no POST.
Sometimes during the ~10 repetitions it manages to boot correctly and is then fine for hours on end. I have checked for dodgy connections to RAM and HDD and seems fine. No HDD probs detected by Windows or Seagate's hardware level tools.
Laptop is about 2 years old and has some eccentricities. The DVD ejects itself randomly quite often. The battery holds about 2 mins charge but removing it and using mains power only makes no difference to the boot problem.
I don't have a spare 2.5in HDD to try out, but guessing it's that or the DVD drive causing power problems at turn on.
Your thoughts are very welcome.