Hi everyone. I've been having a strange issue since I cleaned my PC this morning. When I booted up my PC after cleaning, I got an Error 55 which signifies that no memory is installed/detected. I'm using two identical 4GB sticks of GSkill Ripjaws 1600MHz and both were correctly installed in slots A1 and B1. So I switched out the sticks and put them in slots A2 and B2 and the system booted up just fine. I shut the system down and switched the DIMMs back to their original slots (A1, B1) and now the computer again booted successfully. I played Hitman Absolution for about an hour, then turned off my machine and went out. Just reached home and started up the system. All was fine till I again started the game and it crashed with a BSOD. On reboot I again got Error 55. Did the same DIMM switching procedure and all seems well again. Any pointers as to what might be wrong? I've used the system without issues for 3 months and suddenly this?