Memory might be reduced to one strip. No go, try the other strip.
Although I said this, I have an uneasy feeling that this might be a byproduct of another fault. Just don't know what the noise would have been if it was just a deep down in the (memory) chip fault. Small smoothing/anti spike condencers do fail, and this would be enough to affect the power, but One does not see anything big enough on modern memory module/strip. But anyway, take the optimistic line and eliminate the bad module.
Firstly, have you got more than one? If not, it's off to the shops or a loan part. Secondly, have you changed these before?
I'll make the assumption that you haven't, that way I can get back to mixing my cement.
Although they are easy to change when you've done a few, you have to be careful when doing your first one. There are a few pitfalls.
They will only go in one way round. Note the little indent on the bottom where a couple of contacts are left out of the strip. This must be 'in phase' with the little bit of plastic in the socket.
They often require more pressure to put in than is good for the mother board. I tend to lead in with one end and feed it down from left to right -
but only a tiny angle or it wont fit in the ends.
Try to get a clear idea just how far they are in now. This is important, and the clips at the ends should click in cleanly when it's fully down.
As SB says, there is a strong argument for just re-seating them/cleaning the contacts. So often the problem in the old days. Don't however touch the contacts with your fingers. Some of the voltages found on your fingers - even without static - are potentially (groan) damaging. In fact, try not to touch any part of the circuitry at all.
See how you get on.