Answer for:

my computer not starting

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OH Smeg

Then press the On Button for 10 seconds to discharge the Capacitors in the PS and on the M'Board.

Plug Back in and try turning on now. If it now starts the Capacitors int he Power Supply Unit are failing and you need to replace the Power Supply.

If it doesn't work you need to open the case and look for problems.

I do however think that you'll find that the PS has failed here and that is your main problem. Though depending on who made the PS when it failed it may very well have taken the M'Board, CPU and RAM along with it. It all depends on who made the PS here as if it is a cheap No Name one they are not correctly filtered to protect the insides of the case and they pass along any problems to the internal components. If it is a Good Name Brand PS they will take the Hit from the Mains and unless it is something severe like a Lighting Strike these will sacrifice themselves to protect the rest of the computer.