Thank you for the reply. You are right about the warranty. I'll give that a try when I can find the recovery disk.
Can I ask, please, why you think it's not a hardware problem or what it might be?
My laptop started crashing (Blue Screen of Death) and whining about
looping in ati2dvag.dll which is a display driver for the ATI Radeon 7500 graphics card/chip. I have tried latest ati2dvag.dll driver from ATI/AMD and Microsoft.