Hello community, I have been reading up on a problem that has hit close to home and find this to be an awesome site. I want to be affiliated in an ongoing basis once my issue gets resolved and I post exactly what solved it. I have been a nuts & bolts PC technician since 1994 and have helped many people with their home PCs. You know the old saying about auto mechanic's cars. Well, my wife's PC just developed a catastrophic symptom that has me stumped. We've had many training sessions about getting rid of temp files and shutting down periodically, especially after doing lots of graphic manipulations. When she shut down and restarted this afternoon, she got a BSOD Page Fault in Non Paged Area with the STOP Code: 0x00000050 (0xD84F5E58, 0X00000001, 0X8063CBE6, 0x00000000) When I got home, I tried several things, including Safe mode, swapping the two 512M DDR strips, changing to a 1GB DDR2 strip with the same results (after reading here), except that the first Address block changes with the following pattern 0xDzzz5E58, where zzz is always a different value, even when restarting with no changes. Every attempt at any Safe mode results in a reboot, regardless. All restarts for Normal result in either a reboot or the BSOD. The startup sequence is Acer Splash screen, blank, Windows Splash screen, blank, 2nd Windows Splash screen, blank, mouse arrow, Windows is Starting Up... Splash screen, blank, BSOD. Running Windows XP Home Service Pack 2 Acer Aspire AST180-UD360A with AMD 3600+ 1GB of RAM (either 2 512 DDR in Purple slots or 1GB PNY DDR2 PC2-5300 in Orange Slot) Integrated Video using 256MB of system RAM 250GB SATA HD The system has been working consistently well with XP Home for about 2 years now after I disposed of the Vista that came with the machine. My original thought was hardware, either RAM or Video, but the fact that it goes into BIOS and the initial splash screens points to either; video functionality is gone in its higher stage of operation, or its a Windows file thats corrupted. Any ideas from you folks would be greatly appreciated. Before I try reloading Windows and the agonizing process of getting back to where we were this morning, I hope to get some ideas from this forum. Thank you in advance and Happy Thanksgiving to all.