cannot boot

Hope someone can help with this. Am running a Compaq Presario 2100. Has been
running fine since I got it. I went to use it this afternoon and it failed
to boot. I tried safe mode, last known good boot, normal, safe mode with
command prompt. Nothing works. The boot screen is about 1/3 normal size.
After I select the boot mode, it goes to the splash screen and the visible
area turns blue with 2 small lines which disappear in 1/10 of a second. I
switched boot order and tried top boot with the XP system disk. After it
goes thru a few stages, I get message "session3_initialization_failed" and
it will not go further. I tried looking this up in Microsoft KBs and it
points to a change in hardware, but there have been none. I am running XP
Home, 512 MB RAM and the system has run perfect since I got it. Not sure
about what step to take next. The attempt to boot from the XP disk was to
either 1. repair the existing installation or reinstall it over the current.
Thanks


.

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