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PSU noise and tempertaure questions

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#1 debodun


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Posted 25 May 2011 - 08:46 AM

I have a HP Pavilion 750n desktop with a Pentium 4 processor. My PSU fan is making an annoying buzzing sound. It's really loud when I first turn on the system (it sounds like a food processor), but dies down after a few minutes, but after that, it's intermittent but getting more frequent. I checked the system temp with PC Wizard and it said that my computer temperature is 38C (100F). I'm on my third PSU on this computer and the current one is less than a year old. I'm really getting frustrated at having to invest so much money into this old desktop (new sound card and all those PSUs in the last year). Everyone says I should just get a new tower, but with the new Windows 7, I am concerned that my old software won't work on it (like MS Office 2000). There was a power outage a few weeks ago. For an hour there was like a "brown out" (low electric current), then the power just went out for about an hour. My computer was on during the brownout, but it was making revving noises. After the electrical outage, I started to notice this noise. The outage also disabled my sound card. I wanted to know if this sound is anything to be concerned about, if the outage could have affected the PSU, and if the temperature is normal. Thank you.

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#2 killerx525


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Posted 25 May 2011 - 05:19 PM

Please post a screenshot of HW Monitor in your next post so we can properly check out the temperatures. What is the model of the psu? Also when it makes revving noise, what the computer idle or load?

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#3 caperdog


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Posted 25 May 2011 - 05:53 PM

PSU noise is likely the fan. do you see it spinning or slowing down trying to spin ? if the fan is burn out because of low voltage there could be other damage to power supply . if it is less than a year old, do you still have warranty?

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