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I was playing a game the other day and my pc shut off. It did not turn on, but power was going to the mobo because it has led lights on it. The problem was the power cable, so changed it and the pc started again. However my pc is underperforming, i cannot run games as well as i could before. Could it be the new power cable or the psu got damaged?

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"Underperforming" how? Can you be more specific? (Much more specific) – Shinrai Dec 13 '12 at 20:52
Hi david5, we're missing quite a lot of details about your machine to even begin starting to help you. – slhck♦ Dec 13 '12 at 21:11
Something else is going on. A bad power cord would leave your PC either on or off, not "sort of" with power to the LEDs. – Daniel R Hicks Dec 13 '12 at 21:11
Is this by any chance a laptop? If so, your battery may have failed or gotten disconnected. Many laptops run slower when the battery is disconnected. – Daniel R Hicks Dec 13 '12 at 21:13
desktop pc, the perfomance is worse than before in games. I changed the power cable and the pc works, changed it back, it doesnt start. Trully insane situation. – david5 Dec 13 '12 at 22:31
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closed as not a real question by slhck♦ Dec 13 '12 at 21:10

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.

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The idea of a bad PSU making a computer run slower without breaking things is... implausible. Bad PSU's break computers all the time, but I can't imagine how they would only make the computer run slower and I've never heard of it happening.

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well i checked its noticeably slower perfomance in games. I cant hear my cpy fan or video card fan getting noisy, its like they dont get enough power so they just stay idle instead of stressing. – david5 Dec 13 '12 at 22:29

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