My computer is so huge that I have to keep it on the floor. Everytime I walk on the floor, it turns itself off. My last computer didn't do this and it was kept in the same position.
Does anyone know what the cause of this is?
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You have a BAD CONNECTION as a guess...
Side off and check...
All the best Brett
Re-connect absolutely everything, and make sure nothing loose inside. Mains lead often the culprit, ensure it's pushed hard into PSU. If it persists, may be a cracked joint on mobo, try flexing board gently whilst running to see if it shuts off.
this might sound silly but id consider opening up reconnecting everything and giving it a hoover out ! my was doing the opposite, turning itself on this solved it , guess there was a bit of dust caught someone creating issues .:)