HP Pavilion a250n startup issue

February 26, 2011 at 09:56:37
Specs: Windows 95, 98, ME,, Pentium 2 - Pentium
Hello, I have an HP Pavilion a250n computer which I swapped out a Pentium 4 2.6 with a SL79L - 3.0 GHZ/1M/800 Processor. The computer works on that processor, but I have been having problems eversince. But, I don't suspect is the processor's fault.

When I turn on the computer, the time resets in the BIOS. Then after I set it, it boots normally. Then, lets say I unplug the power and plug the power back, then the time resets AGAIN.

Then, lets say I don't unplug the computer. When I turn off the computer and turn it on, the processor fan spins REALLY LOUD and nothing happends. I turn off and turn on the computer again and it does the same thing. I turn off and turn on the computer again and then it starts up normally, and from there, the computer works perfectly even though I had to turn on/off the computer twice or three times.

I tried updating the BIOS, and it didn't help. How do I fix these issues?

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February 26, 2011 at 10:10:54
It appears you may have more than one issue. The time issue may be caused by a weak or dead CMOS battery. That is the silver coin shaped battery located on the motherboard. Buy a new one and install it. Be sure the computer is unplugged while doing that.

The second issue may be related to how you remounted the heat sink/fan unit. It you didn't apply the correct amount of new thermal paste or a thermal pad, after first cleaning off all the old stuff, your processor may be overheating.

You need to enter the BIOS screens and check CPU and system temperatures and also the settings for alarms and shutoff temperatures.

Did you just swap out the CPU or did you verify it is compatible with your motherboard?

Another possibility is when you were mucking around inside the case you moved the RAM, cards, or connections. Re-seat all the RAM by snapping each one in and out 4 or 5 times. Re-seat all other cards and connectors.

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February 26, 2011 at 10:16:18
Othehill, thanks for your answer, it appears everything you said is right, let me reseat everything and see how it goes. I didn't put thermal paste since I didn't have any and the CMOS battery, uhh I think theres nothing wrong with it but lets see what happens when I put a different battery. Will a response.

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February 26, 2011 at 10:25:32
Not a wise upgrade considering the age of the system. Hopefully you got the CPU extremely cheap, like $10-20?


The time resets because the CMOS battery is bad - replace it.

The fan "spins REALLY LOUD" because you didn't install the heatsink/fan correctly when you swapped the CPU. It's very important that the thermal paste is applied correctly & that the heatsink is properly seated & fully locked down.


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Related Solutions

February 26, 2011 at 10:25:53
If you need to reset the time every time you turn on the computer again then the battery is probably bad. This applies if you are using a power strip or other device to completely interrupt the power to the computer. The battery only matters when there is NO power to the computer. Doesn't matter if it is on or off.

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February 26, 2011 at 10:47:43
yes mickliq, i also felt the same until i found out that the cpu was only 14 dollars off ebay, I gave it a shot.

I didn't put any thermal paste on my new processor because I didn't have any, but I think thats the initial problem with this computer, side the the CMOS battery not functioning properly.


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February 26, 2011 at 11:40:36
Thermal paste is $3 at Radio Shack.


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