HP DV9205US laptop turns on/off on/off

When the power button is turned on, the keyboard lights up but the screen stays black.  Then the laptop loses power for a second and then the power comes back on.  I have tried different combinations of having the battery in without the ac adapter, battery out with the power adapter and it hasn't made a difference.

Starts to boot off UBCD for win, but then it freezes on windows xp load screen.
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computerteachConnect With a Mentor Author Commented:
HP had a recall on this computer and replaced the motherboard for no charge
Disconnect hard drive and all possible peripherals, including PCMCIA cards; try booting with a bootable CD again. If more than one stick of RAM in the system, try with one only.
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