Question about HP Pavilion a420n PC Desktop

2 Answers

Fuse NOTE: I couldn't find an HP Pavilion a475c--which is what my model is. We got a hard drive is bad error. I did a standard restore which seemed to work until I shut it off and then it came back with the same bad drive error.I replaced the hard drive with a Western Digital 3000 40-pin conducter. At that time I took out the battery also. Now the pc will not turn on. I took the hard drive back out and put it in a case and I could access it. I unplugged everything including the power cable, held the power button for 5 seconds, switched the red power supply from 115v to 230 and left it for 5 seconds and then switched it back. Still nothing. The green light in the back is flashing. I'm out of troubleshooting ideas. Help! Also--is there a fuse? Inside the power module it says to replace with identical fuse--but I can't find the fuse, so I haven't troubleshot to see if I have a bad fuse.

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 6,966 Answers


I doubt if you have a blown/bad fuse since you still get the green light flashing meaning there is power coming into the board from the power supply.

Since your only action was to replace the hard drive and the unit was working (with HD problem) before, it could only possibly be a component not properly connected/seated. Start with your memory and video card (if you've got one) and check if they are installed into their appropriate slots. You can also try removing them and cleaning the gold pins/connectors with a pencil erase. Other than that you may want to do a double check of all your wirings or anything out of the ordinary. Do an R & R, remove & reinstall of all your cards, connectors. Additionally, pls confirm that your CMOS/BIOS CLR jumper is in the default position and not Reset.

Any beeping sound or error indicators?

Hope that this be of initial help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

Posted on Nov 16, 2007

  • herman guerrero Sep 11, 2011

    I had the same problem, I removed the cmos battery, unplugged all the connections, waited for ten minutes then re-connected everything including batter, my computer started right up> I also agree in what the other gentlemen is saying it could be a component not seated right, try them both good luck


  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 7 Answers

Are there any fans moving in the case? As in, are you getting any power? If no fans are moving, it's possible it's:
1) the power supply (PSU)
2) your 'jumper' from the power button to the motherboard has come unplugged
3) you're grounding out somewhere

One cheap-o way of testing a power supply is:

Turn your power supply off.
Unplug your power supply.
Get a paper clip.
Bend it into a U-shape with the ends close together.
Put one end of the paper clip into *the* green wire in the plug of the PSU.
Put the other end of the paper clip into a black wire of the PSU.
Plug in the PSU.
Turn on the PSU.
If the fan runs in the PSU, it's safe to say this PSU is in working order.

If the the power supply was fine, but when you hit the power button and it no fans inside the case move, check the plug from the case to ther "power on" jumper on the motherboard. if that's correct, I'd suggest removing the entire motherboard from the case and setting it onto a phonebook and see if it'll turn on there.

If fans are moving when you hit the power button, but no beeps, fans turn back off after a moment, ect:
1) Motheboard is bad
2) Processor is bad

These are the situations that are most likely.

Computers are picky about being played around in. You can look at them wrong and they'll stop working. Sometimes it's as simple as pulling them apart and putting back together again to make them work... at least in my experience. I wish you the best of luck.

Posted on Nov 16, 2007


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a Pavilion ze200 laptop. I purchased a pc clean program and it deleted everything off my hard drive. I have the disc to restore the operating ststem and the drive recovery but when i try to install...

The only time I ever got in trouble with a computer involved deleting files.

The cleaner program is too aggressive if it deletes files that windows needs. dont use it

The install for windows expects an empty formatted drive to install windows. The program you used has changed the hard drive in a bad way.

Try this: write down the errors and send to me at and I will assist you further

Apr 20, 2011 | HP Pavilion ze2000 Notebook

1 Answer


There's either a problem with the discs themselves, dirty, scratched.

OR cd / dvd lens is dirty: Clean with dry q-tip

OR You've got a bad sector on the hard drive that is preventing restore.

Try restoring the computer with a new hard drive, that's usually it on older machines like yours ;)

Feb 20, 2011 | HP Pavilion zt1130 Notebook

1 Answer

When i start my pc,it displays operating system not found

Go into the BIOS and see if the hard drive is recognized in there. If it is then try restoring it with the recovery disks. If the error still comes up then that means the hard drive is bad and would need to be replaced. Also if the hard drive is not recognized in the BIOS then that means the hard drive is still bad.

Apr 23, 2010 | HP Pavilion dv9812US Notebook

1 Answer

HP Pavilion DV6812 is not recovering or restoring!!

If you mean this errors
STOP 0x0000001a (0x00041284, 0xca9a2000, 0x000077e0, 0xc0c00000) MEMORY_MANAGEMENT
STOP 0x0000004e (0x00000007, 0x00007abf, 0x0000f17e, 0x00000000) PFN_LIST_CORRUPT
STOP 0x0000000a (0x00000028, 0x00000002, 0x00000000, 0x8012d2d6) IRQL_NOT_LESS_OR_EQUAL
STOP 0x00000050 (0xc2332b94, 0x00000000, 0x00000000, 0x00000000) PAGE_FAULT_IN_NONPAGED_AREA
Its ram problem,so first if you can access the bios check if your ram are been recognized and load default bios settings.If are OK in bios remove RAM and reinstall again.If the problem still exists try again testing your Ram with the Microsoft program or with that.
If the programs founds an error you RAM are damaged and replace them.

Feb 04, 2010 | HP Pavilion dv6812nr Notebook

1 Answer

HP laptop will not recover or restore! HP

Run a system restore back to factory default setting.

Start system and hold down the f11 key till it rings a bell.

This will start the restore program.

Follow the system prompt. But remember to backup your documents and files.

Good luck.

Feb 04, 2010 | HP Pavilion dv6812nr Notebook

2 Answers

Hard Drive Error during system recovery

You need to run a hard drive diagnostic disk in dos,(before windows starts) First check with HP, You can also use a program called HDD Regenerator 1.51. This will check the drive for bad sectors, and then you can try and repair them. This way you might
be able to see some of the data you want. If the sectors that where
repaired had the operating system on them, you should just get a new drive,(if not under warranty) then after you have a new OS installed on the new drive, you can plug in the old drive and see what you can recover.


Feb 25, 2009 | HP Pavilion a1610n PC Desktop

1 Answer

Hi,? my machine has an error of loding operating system it's hp 530,it brings this informationn (no hard drive were found ,so it is not detectiting any hard dirve installed.

The most likely explanation is that your hard drive has failed. You can try removing and reseating it. Failing that, borrow one for testing or buy a new one. As a last resort, try putting the hard drive ( or even the whole laptop ) in the refrigerator overnight. Really! :) If this restores operation even temporarily you definitely have a bad hard drive.

Jan 01, 2009 | HP Pavilion dv6000z Notebook

1 Answer

PC Won't Power Up

I'd guess the problem is either the hard drive connector in the bay (trying putting in the original drive and seating it very solidly) or else the motherboard hard drive controller (rare problem). You can diagnose which of these it might be by putting the hard drive back in and then booting into the BIOS (F10 or delete at boot up) and then investigating whether the hard drive is being correctly identified by the BIOS. If it is, run any tests or AUTO options it has to see if the BIOS can contact the drive properly. Then, step through the BIOS settings and try turning on and off settings like SMART FOR HARD DRIVE and so forth and rebooting in cycles after every change. It is also possible that with the power problems you've described, the BIOS got reset and may need tweaking to get it working again. If you see evidence t might be a BIOS reset problem (for example, the system clock is crazy wrong), try to LOAD SAFE DEFAULTS AND EXIT option in the BIOS. If you test it all this way and find no problems, and you can access the drive normally on another machine, it is probably the motherboard IDE controlled. Will it boot from a CD/DVD? They are usually on the same IDE channel and so failure to boot from a CD tells you something is wrong in the hardware.

Good luck...

Nov 16, 2007 | HP Pavilion dv4000 Notebook

Not finding what you are looking for?
HP Pavilion a420n PC Desktop Logo

160 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18424 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers


Level 3 Expert

538 Answers

Are you a HP Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides