Two thing come to mind.
Damage in transport - Presumably, everything worked properly at home before you moved your systems to campus. Perhaps things came loose when the PC's were moved.
Open up your cases and re-seat the ram and power connectors.
Power - How reliable is the mains power at on campus? What kind of quality are your computer's power supplies? Investing in a UPS may resolve your issue.
Damage in transport - Presumably, everything worked properly at home before you moved your systems to campus. Perhaps things came loose when the PC's were moved.
Open up your cases and re-seat the ram and power connectors.
Power - How reliable is the mains power at on campus? What kind of quality are your computer's power supplies? Investing in a UPS may resolve your issue.