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I have a board, which has three switches. When I connect my PC's power card to that board, I see a spark in the switch. However, if I connect a TV or a radio, I don't see any sparking.

Do I have to replace that switch? The entire board? Do I have to check the power supply of my home? I suspect that this problem may be occurring due to voltage variation.

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It's not clear from your question what you mean by "board"? I'm guessing maybe a "power bar"? A picture might help, as well as what country you're in (which will tell us what voltage, type of plugs, etc). – gregmac Mar 10 '11 at 21:23
@gregmac: looks like the OP is in India, which has 230V @ 50Hz – Doresoom Mar 10 '11 at 22:14
Just found this resource for voltage, frequency and plug type: kropla.com/electric2.htm – Doresoom Mar 10 '11 at 22:17
if this turns out to be a computer problem this question would be better suited for Superuser – allindal Mar 11 '11 at 20:23

It sounds like the PC's PSU is either on, or draws considerable power even when it's supposed to be "off". I'd be looking at replacing the PSU.

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