Computer want switch on,press on button and it goes off imediately after, took it to computer shop for repair they kept it for a week , went down there on friday and they had changed the power supply unit, but then hadnt even looked at it after, but they had disconnected all the wiring inside.They couldnt even ring up to say they hadnt bothered, so got it back off them.

Any advice

Take it back along with a cricket bat.

Where are you geographically?

& what’s the name of the shop so we don’t go?

Does it bleep?

well after an hour have reconnected all the connectors to each other, and it still doesnt start up, light comes on, when on button pushed and then goes imediately off