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Tuga99
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Message 1 of 7
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Switches on for few seconds followed by 4 bleeps, repeats bleeps every few seconds

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HP Compaq 7800 ultra slim
Microsoft Windows XP

Switches on for few seconds followed by 4 bleeps, repeats bleeps every few seconds

6 REPLIES 6
itsmyname
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Message 2 of 7
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@Tuga99 -- do a Google-search for "HP Beep Codes", and try to match your pattern against the HP documents.

 

It could be a "loose" add-in video-card, or a bad stick of RAM, but could be something worse.

 

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Prométhée
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hi

 

https://support.hp.com/us-en/product/hp-compaq-dc7800-ultra-slim-desktop-pc/3459242/manuals

 Illustrated Parts & Service Map - HP Compaq dc7800 Ultra Slim Desktop Business PC

does it look like this?

Power Red 4 blinks, 1 blink every second
followed by a 2 second pause
Power failure (power supply overload)
OR on USDT the wrong external
power supply is being used.

 

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Attention
A bios update is not without risk!
Be aware that if you are offered to do so, it will be at your own risk, the computer may become unusable, think about it



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Tuga99
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Message 4 of 7
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Yes, it could br the cause. I've tested the power supply and it only reads 18.6v , it should be 19.5v. Need to try another power supply. Thank you for your help

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Tuga99
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It is not the power supply, have got new one (19.5v)  but problem persists, need help please 

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Prométhée
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Is it the same power supply ..
If so, apart from doing a series of tests, more or less easy, impossible to certify anything
Either you spend a lot of time, testing each element, and you still have to have what it takes
either you go to a pro who would eventually test everything, or almost everything!
how old is your computer, can you buy a new one, the costs to repair the one if could be high

--------------------------------------------- Signature ---------------------------------------------
Please remember to mark the answers this can help other users
please click on the accept as solution button if message provided an answer to the problem

was this reply helpful , or just say "thank you " ? Click on the yes button
Attention
A bios update is not without risk!
Be aware that if you are offered to do so, it will be at your own risk, the computer may become unusable, think about it



Desktop-Knowledge-Base
------------------------------------------------------------------------------------------------------------
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itsmyname
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@Tuga99 -- need help please 

 

As an experiment, if you connect the "old" power-supply to a DIFFERENT desktop computer, does this power-supply work properly on that other computer?  If so, I would suspect the motherboard in your computer is causing the issue.

 

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