Today I purchased a memory module for an older laptop (Model No. Compaq Presario 1500US). The module I purchased was a 512mb Corsair Value Select DDR-266mhz stick. When I put it into my laptop's free slot it booted fine and worked for three hours. When I rebooted it, however, it displayed the windows loading screen with the blue bar, and then immediately bluescreened and rebooted. The STOP error is displayed for a fraction of a second, so I can't read any information on it (Unfortunately) I tried rebooting with only the original stick in and it got the same error. Same thing with only the new module, and the same thing when I tried safe mode. Do you think this is a memory issue or could it just be that my 7 year old machine has just given up the ghost?