Question about HP Pavilion A520n (DW233A#ABA) PC Desktop

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Pavillion a520n overheats and reboots. Fan on CPU runs during boot up then shuts off. Starts again when reboot occurs. Suspect thermal sensor not working. Is it in the fan or on the motherboard?

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On motherboard. Please, make sure all fans are connected into motherboard.
Some fans can't plug in into the board at all. So, you can ignore those fans.
When you go to Bios to check thermal condition, if a fan is not plug in, you can see 0 degree. 0 degree dosen't cause the shutdown problem. (That's why you can ignore)
Then check which fans are causing problem, first. (If you did and found the problem, go next.)
Replace fans AND clean those dust!
If the problem remains, then replace its case to steel one.

Well, usually a lifetime of CPU fan is pretty longer than others.

Just in case, one more thing, if the thermal condition is OK, then the shutdown problem is caused by something ales!

Posted on May 27, 2011

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Posted on Jan 02, 2017

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There are a lot of possible reasons for this.
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Sounds like you are overheating. One way to tell if it's overheating is you say it will run for about 30 minutes then shuts down. When it shuts down try rebooting to see if the boots successfully. If it fails to boot successfully right after it shut down then you are probably overheating. If you wait awhile to let it cool down for 30 minutes or so and if you reboot and it does it successfully you definitely have a overheating problem. If I remember correctly all those compaq sr series have loud and fast running fans. Computers overheat because of three reasons for the most part: 1) A fan has stopped working. 2) The Thermal Paste on the CPU and Heat Sink has dried up or is not thick enough to keep the unit cool. 3) Dust has clogged the fan vents and inside the computer. Fortunately for you desktops don't have to be completely disassembled like laptops to get to the fan, CPU and heatsink. Just pop the case and you'll see the components attached to the motherboard

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1 Answer

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these posts are endless here, truely
had to google it ah a DESKTOP
old Pentium 4 processor
circa 2003 , tiny HDD, and memory. old, Goodwill has 1000s parked.

well it can be many things,
did you remove all the cards first, (yes all)
does that hold up power? now?
it will beep, like that, if video car is pulled
and then pull memory, and it will give the ram missing beep codes
all this is covered in the great HP service books.,
beep codes and all
the power switch can be bad or the line cord. to wall. bad.
the power switch unplugs and you can short its 2 pins
to turn on PC< hold up now>?
hold up, means stay running,

you can strip it down, to just mobo and PSU
sure can,.
the CPU can overheat, sure can. and can be checked.
cpu fan works so is not that. im sure. and new thermal grease.

data sheet shows. (pull it,?)
nVidia GeForce4
GeForce4 MX
MX
440 440 AGP
AGP 8x
8x graphics
graphics card
card

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Sounds like a cpu overheat situation. Check the cpu temps in the bios and compare the temps with the maximum operating temp of your particular cpu. It might need better/or/new cpu thermal paste applied to your cpu, and also check that your cpu fan is running and locked down tight (and not loose)

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