Here is an update. I would try periodically to boot the system. It randomly booted up and the sytem took me through some sort of system restore. I went through the process and the computer started and I was able to log onto the system. Once I was at my desktop I checked the Vista Problem & Solutions. I was in this process when the screen blinked and an error message came up saying nvmdld driver error or something of the sort. I did a search on this and it appears that there have been reported problems with the Nvidia 7900S graphic card and Windows vista.
From what I could find on the Nvidia forum it usually occurs during gaming but mine is occuring during routine web surfing. There is no fix from Nvidia and the only solution that anyone had posted was to go into the Bios and change the system voltage on the chipset. FSB from 1.2 to 1.3 and SPP(PCI) from 1.2 to 1.3. Someone had also posted that they had altered the Memory Frequency down to 666 or unlinked the memory ?
Before I could do anything the screen blinked again and went to the gray screen. So I believe the problem is with my Geoforce 7900S that came with my dell laptop. I have heard it is not easy to change out the graphic card in an laptop.
Based on this additional info I would appreciated any suggestions. The computer is not under warranty.
I did a search on this forum and found others with Graphic Driver Problems. Many refer to their Power supply not providing enough power. I am now wondering if I damaged the graphic card or that I am causing the problem by using the 65 watt power cord instead of the 90watt that the computer came with.
Edited by joepdx, 10 January 2009 - 07:57 PM.