I had a very elusive fault with this laptop. Flexing the case even slightly caused screen flashing then blue screen or freezing. Having fixed a suspicious loose ribbon cable at the back of the display I was still getting a black screen and freezing up.
It turned out that the dram dimm under the keyboard had a solder spike on an sm cap that had pierced the insulation under the lid!
I hope this may help others. It was a Samsung 512mb by the way.
John.