Hello, Can a bad ram stick stop a computer from starting up? When I power up all the fans and driver run. Best Buy checked the power supply and it is ok. Yellow light below power button comes on for a couple minutes. no beeps though. Moniter says power saving mode and goes blank. Checked out hard drive in a box on the lap top it is good all the files are there. It acts as though it cant find the system bios to start up the os. Can a bad ram stick cause this or can the processor find what it needs to run directly from the hard drive?