This sounds like it is a hardware problem. If you don't see the POST screen, then either something is screwed up in the BIOS, or there is faulty hardware.
The display drivers will have no effect on the POST screen. Deleting the display drivers would not cause that kind of trouble.
well she said already that she don't have the recovery disc so shell have to send off for them from sony or try and buy a set on ebay
EDIT: It couldn't hurt to download and run memtest86, to see if there are memory problems. http/www.memtest86.com/
I suggest you go to the Sony Viao European website for dowloads and manuals.
You have to start of by entering the serial number in this link and go from there