Keep cycling on and off

What system?

I am sorry. I have an hp pavilion a1620n and it keeps cycling off and restarting when it gets to the windows screen. I am unable to start in safe mode, last known good mode or windows normally. I am trying to avoid system recovery and losing all my stuff

Windows XP

I would suggest a repair installation at this point

Repair Installation
A Repair Install will replace the system files with the files on the XP CD used for the Repair Install. It will leave your applications and settings intact, but Windows updates will need to be reapplied.

http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx