Multiple BSOD's no obvious pattern

For the last several weeks, I've started experiencing multiple bsod's. Since the laptop was 2 years old, I opted (after malware scans) just to wipe the drive and use HP's recovery tools to reimage to new condition. However, the BSOD's continued. Ran Memtest overnight with no errors. Ran Norton Recovery tool from USB boot, no malware/viruses found. Uninstalled norton and installed Microsoft...