Weird continuous beeping sound coming from the back of the computer

kraver0

Honorable
Jul 22, 2012
41
0
10,530
When my computer is turned on and you place your ears next to the back-side of the computer. I hear this continuous beeeeeeeep sound that goes for approximately 10 seconds, then skips like 0.5 seconds, and then continues to beep for another 10 seconds. This cycle doesn't stop. It keeps on beeping like that even on idle.

It's not loud. But when you place your ears next to the back of the computer, you can hear those annoying beeps.

As I researched a little, it seems like the problems are: (1) system memory, (2) motherboard, or (3) video card.

I ran a diagnostic test using the DELL PC Checkup program and my results for the hardwares I mentioned above were ALL PASS. Not a single fail on any of the tests.

Is this beep sound normal for a computer? This sound really concerns me..

I have an XPS 420 btw.