Hi I have a P4 3Ghz socket 478 CPU and an intel D875PBZ mobo with 768GB RAM. I have a very annoying problem, occasionally when the power button is pressed on the front of the case of the computer the computer fails to start. The fans twitch and the HDD LED flashes but that's it, no beeps. It is fine 90% of the time. This problem occurs after the computer has been moved. The computer is in a rack mount case inside a flight case. It is moved around from location to location. It seems computer will start after if it has not been moved for a while, ie left after being moved. That seems not to make sense! I can eliminate: The power supply: problem occurs with other power supplies in place and original power supply works on another comp The motherboard: this has been replaced with a known working board. The switch: the problem still occurs if the pins on the motherboard are shorted, bypassing the switch. This leaves me with as far as i can see the CPU and the RAM. Inside the case there are brackets for securing the PCI cards in place. These clamp onto the top of the cards to stop them wobbling. I have moved 2 of these that were spare along and adjusted them so they now push down on the heatsink/fan of the cpu, one either side. I'm fairly sure that this will stop the CPU becoming unseated. I also reseated the CPU before hand. I then moved the computer about to simulate what would happen in normal day to day stuff. The problem still occured!! This leaves me believing it is the RAM that is causing the problem by becoming unseated, is this possible? (If u have no RAM in the computer beeps) How could i secure the RAM? silicon sealant or simliar? Anyone had similar probelms?