Power off if pc is knocked

[SimonCleaver]

Hi all,
Have a pc with power problem.
Powers up ok, but if the machine is knocked, even slightly, it immediately shuts off.
I have changed the power supply, but still have same symptoms.

I am guessing something is loose, but where should I look?
I have checked all power cables are fully inserted.

many thanks for any ideas.

 

[BoBBYI986]

could well be shorting when you knock it, make sure everything is properly seated, cpu, ram, graphics card, also check to see if the motherboard isn't touching the back of the case. try changing your kettle lead.