VGC V2M - not start after deefrag with a strange screen like space invaders

[gmontanino]

Hi All,

I own a splendid Sony Vaio VGC V2M (Italy) with XP Home edition.

 Yesterday I was performing winter cleaning. After start a defrag the PC restarted and this is the screen that appears:

I tried:

1) to disassamble it (thank to Exinferis guide) in order to remove the BIOS battery. Result: not able to access to it

Any suggestion?

Thank you in advance