This brand new computer is giving me a headache. If I walk away after reading my email, more often than not, when I come back, I’ll only get a low rumbling sound from my computer. The speakers that I have on the top of the desk won’t work. I then have to unplug them, and plug them back in again. Is this a problem with my sound card? I know the speakers themselves work just fine because I can use them to play music from my streem.