laptop won't start

  Botch Casually 16:47 08 Jul 08
Locked

It's an old HP pavillion zt1231s.
When the power button is pressed it either starts and may even run fully up into windows- but then freezes- or else it will make a strange noise from the drive and sits there with no screen output at all not even the backlight. sometimes in the second state it produces a 16 second long beep and will at about 30 second intervals repeat this beep.

i have tried substituting a spare drive. I managed to try reloading the operating system to factory default. I have removed the cd drive to no avail I have also reapplied the thermal compound.
Once in a blue moon it will start and run, working normally for hours, until you next turn it off.

One last item it fails to charge the battery, again a substitute tried.

Any help would be appreciated.

  woodchip 16:56 08 Jul 08

Try the Laptop without the battery

  Botch Casually 16:57 08 Jul 08

I already did - no go
Thanks

  woodchip 21:31 08 Jul 08

How do you know that the new second hand drive is any good

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