Question about HP GQ640AWABA - HP Compaq dc7800 Convertible Minitower PC Desktop

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Hp dc 7800 not powering


i have a problem with my Hp Dc7800 that doesnt power on tried new power supply but still the same problem(when powered nothing happens when you hold the power button you see a green power light)

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  • simon278 Jan 26, 2009


    I tried another processor but still had the same problem



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Bad Processor

Posted on Jan 24, 2009


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5 beeps dc 7800 ctm fix

try these

HP Guide to beep codes:
(see your machine spevcs for which BIOS you have if you don't know)

and many more generated by searching the internet for "5 beeps hp dc 7800"

The second reference I posted is possibly the place to start

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How to fix dc7800 small hp conputer fan too noisy

Hi, we have all parts which you can replace it a new one ''

Aug 22, 2012 | HP Compaq Dc7800 Small Form Factor Core 2...

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All fan on desktop pc hp 7800 are very loud

Hi' yes we can provide parts like power supply,cooling fun anytime as you want to make any replacement ''' thanks for using

Aug 22, 2012 | HP Compaq Dc7800 Small Form Factor Core 2...

1 Answer

My hp scanjet 7800 does not turn on, the adapter has the green led light showing that it is getting power

First get a multimeter and check if the power is going through the adapter to the end of the cord. The AC/DC transformer should output 32V DC at the end going into the scanner. If it has power, then the scanner power switch or the unit itself has failed. If there is no power passing through the cord, then try a new adapter. (You can find some by Googling - I saw some from various vendors.) If it is the scanner itself that has failed, check if it is under warranty.

If it is under warranty, contact HP for service. They may have the power cords as well but I didn't check that far. Otherwise decide if it is worth the service charges.

I hope this helps.

Cindy Wells
(at least I do not think this scanner has a hard power switch on the side of the unit.)

Oct 04, 2011 | HP Scanjet 7800 Pass-Through Scanner

1 Answer

I have HP DC 7800 copmuter,I installed Windows 2000 pro Audio Driver not working

you can always try the windows me driver if hp does not have the driver on their support site

May 08, 2010 | HP GQ649AWABA - HP Compaq dc7800 Small...

3 Answers

Won't boot. Series of Beeps plus red light

If nothing was displayed on the monitor during the beeps then change the RAM stick(s)


Oct 29, 2009 | HP RT935UAABA - HP Compaq dc7800...

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