|Sometimes the slightest disturbance can cause edge connector issues to turn up (things move an imperceptible amount onto oxide). Remove the RAM sticks and the graphics card if it is separate and clean their edge connectors with a soft pencil eraser. Pop them in and out a few times to clear oxide off the sockets.|
Same applies to any edge connectors. I have had trouble with SATA power and signal connectors.
If that doesn't help, discharge the motherboard components because they can sometimes memorise bad conditions. The procedure is to turn the computer off and remove the power cord. If it is a laptop you remove the main battery too. You then hold the Power Off/On button for about 20 seconds to do the discharge. Reassemble.
Always pop back and let us know the outcome - thanks
message edited by Derek