Question about HP Pavilion A820n (PP165AA) PC Desktop

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I replaced the original two 250MB RAM with 4x1GB RAM and the backlight is now blinking but no power! It is an HP a820n pavilion desktop.

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There are a couple things you will need to check. Start with the basics. Remove the side and check all the power connections. Check the main board power connector but also don't forget to check the front panel power switch connection. Check the Case Open connector also if equipped and active.

If your still having problems check your RAM to make sure it's the correct type. It should be PC3200 DDR SDRAM DIMM. You may need to remove the new RAM and reinstall the old stuff just to help narrow down the problem. If the computer returns to normal operation after you switch back you'll know it a RAM issue. If not then something most likely happened while you were doing the swap.

Try switching the RAM back to the new again but use one at a time. If they all check out try using one stick and testing the RAM slots one by one.

After you have down this and everything checks out enter your bios and reset it to default setting and try again. After that if you still have no luck repost back here with your results and I'll try and help troubleshoot the problem.
Hope something here helps.

Posted on Nov 16, 2009

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Did you put in the right type of RAM? many times this will happen if the wrong type is installed or if one of the sticks is bad, OR if it's too much ram for the motherboard to handle. The older systems that run with SDRAM will only go up to 512MB.

Posted on Nov 16, 2009


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Motherboard replace processor cpu i have an hp pavilion a820n tower with no cpu or power supply can u tell me what kind i need?

the processor to fit the mobo is a pentium 4 socket 775. the original was a 3.2G according to the HP website.
most standard 500 watt power supplies should fit.
it does concern me why there is no processor or power supply in it though.
are you sure the mobo is ok? the only reason I would think these parts have been removed is because the mobo is dead and they've been transplanted into something else.

May 11, 2014 | HP Pavilion A820n (PP165AA) PC Desktop

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Green light on my power supply stays lit after unplugging

Usually the light will time out after the capacitor has drained. Your machine is getting a bit old , your PSU may be the problem. If you plug it in and push the on/off button and it blinks, fans spin and shuts down, it's most likely the PSU. Look for a in-line fuse on the Motherboard, if blown, replace. Look at the motherboard closely for damaged components, capacitors, etc.

Jan 27, 2013 | HP Pavilion A820n (PP165AA) PC Desktop

2 Answers

I can not find the hard drive in hp pavilion A820n

Thank you for your Service!

The hard drive will be about 4"x5.5"x1" and is almost always mounted immediately below the dvd drives in an enclosure like the one you pictured. But you're in a situation where you don't have a lot of time to get it right, and if you're problem is that you're out of space on the primary drive, you probably need to be transferring to the new drive, and you'll need a working computer to do that. My suggestion is to take it to the repair people at one of the big box stores and have them get it going for you.

Mar 13, 2017 | HP Pavilion A820n (PP165AA) PC Desktop

1 Answer

My HP Pavilion a820n pc desktop fan runs constantly. I don't think it always ran this much. Previously ran then shut off then ran. We vacuumed the visible dust. Does this signal a problem? Thank you. ...

Fan is inteligent, has sensor when cooldown is reached auto slow down to fix needs to be replaced,will not hurt anything system running cooler is always a good thing i would run it till it dies unless noise is an issue

Jan 20, 2011 | HP Pavilion A820n (PP165AA) PC Desktop

2 Answers

Fan goes into high gear, won't boot up

Solution 1:
1.Disconnect all cables and connectors with in a cabinet except power supply (SMPS)take out RAM and clean it with cloth and Reinstall it on same place.And you can also check with new RAM. If this step not solve your problem,go to next step. 2.Check with New SMPS if it doesnt solve problem, your motherboard may faulty.

I think it helps..let me know

Dec 29, 2010 | HP Pavilion A820n (PP165AA) PC Desktop

1 Answer

Does not power on, but get a green blinking light at the reap of computer. I think its my power supply. what do you think?

do you try to check your power supply? try to other pc if it is your power supply because if it is the result is the same problem to other pc you tested it is your power supply. But try first to check your memory card to remove and put it again then restart it to open.

Aug 11, 2010 | HP Pavilion A820n (PP165AA) PC Desktop

1 Answer

Hp pavilion a820n comp won,t turn on . rear power light blinking , turned all power off several times waited long intervals before repowering unplug all plugs and tried still no power up found when mother...

make sure nothing is plugged in to your front card readers slots:
If so PC will not boot. Other then that can you put a different power supply in it? Just to see if it is the Power supply..

Jul 26, 2010 | HP Pavilion A820n (PP165AA) PC Desktop

2 Answers

HP a820n No Power-up after City Power Failure

You have a bad power supply. It is not an expensive fix. Remember HP's take HP power supplies. When ordering either look on ebay for your model or order from part supplier.

Aug 22, 2009 | HP Pavilion A820n (PP165AA) PC Desktop

3 Answers

Computer wont turn on

taking out the battery resets the settings on the bios for the motherboard.

worked for me on the few computers that wont turn on.

If it starts up, you may need to enter dates etc onto the bios.

May 29, 2009 | HP Pavilion A820n (PP165AA) PC Desktop

1 Answer

Green power supply light blinking? HP Pavilion a820n

These wires vary based on the type of the board each wire lead is labeled to coorespond with the pins on the board. You need to reference the manual for your specific motherboard. If you don't have the original get it from the vendor support site or just google it. Unless your motherboard is an odd brand it should be easy to find.

Mar 28, 2009 | HP Pavilion A820n (PP165AA) PC Desktop

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