What kind of sounds? A sequence of beeps? Long and short beeps? If so, this will help to diagnose the problem.

Well, you have eliminated the KB as the problem, this leads me to believe that the problem is on the MB. Did you get extended warranty?

In Tokyo, Japan's space agency announced the Kodama communications satellite malfunctioned after being affected by the flare. The agency said it was temporarily shut down and would be reactivated...

Its a solar flare, not an EMP.
There is nothing in the article warning about the ability of the storm to fry computers.
The charged particles at most will only disturb electromagnetic fields.

You will need to open up the power supply. There might be an internal fuse inside the power supply. The green light probably means that the supply is receiving AC input, but there might be a fuse...

Need more info: What does the flashing amber lite signify?

Who is the MFR of the computer? Let us know so that we all don't go out and buy that brand... if all the MRF can say is that it is not anything IN the computer...Then what OUTSIDE of the computer...