Two things:

1: I know some places it's common to refer to the computer itself as the CPU, but the CPU is a single component within a computer. It's an important distinction to make if you're going to be able to effectively communicate with people about getting this fixed

2: Your symptoms are classic of a bad caps (google it) problem which means you need a new motherboard. So if the unit is under warranty at all, make it the manufacturer's problem to fix, otherwise you probably want to get someone else to do this. Replacing a motherboard means taking virtually everything out of the computer and putting it back in with the new board. It's not a simple procedure.