Question about HP Pavilion a420n PC Desktop

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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.

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Hi,

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

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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
or
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

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Posted on Jan 02, 2017

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