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Problem with HP compaq dc 7900


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#1 JohnnyBla

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Posted 07 October 2014 - 03:25 AM

I have a problem: i have a HP compaq dc 7900 that works randomly. Some time does starts and works perfectly, sometimes, when i press the power button a fan starts to make over limit noise, and the the monitor it`s black... doesn`t displays anything. Sorry for my englesh. I still try to improve it.



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#2 gavinseabrook

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Posted 09 October 2014 - 02:40 AM

You may want to open the case and check the capacitors (Cylinders) on the motherboard and see if any of them are "Doming" at the top. They should all be flat (with little cuts in them to allow them to expand when they go bad). If you see any of these doming (rounding at top), or leaking/have crusty stuff on the tops, it could be a motherboard issue. That is the problem with small form factor PCs is that heat really damages these and in tight spaces it gets worse (Depending on model of DC 7900). 

 

The other issue it could possibly be is an issue with the memory or CPU. It may be as simple as just re-seating (remove and re-plugin) or it could be something more. 


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#3 JohnnyBla

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Posted 09 October 2014 - 04:56 AM

i have opened the computer and all the capacitors seems fine. I already checked the rams and they are also fine . Any other ideas



#4 zingo156

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Posted 09 October 2014 - 07:25 AM

Here are some things you can try:

 

Make sure you have the computer unplugged from power while removing or moving any hardware...

 

Try 1 stick of ram in 1 slot at a time (remove all other ram sticks). Move it to the next slot until you have tried that stick in all slots by itself. If you still have no post, try a different stick of ram in each slot by itself. If you have issues with the stick in 1 particular slot (a no post for example) the slot may be bad. It is also possible you have a bad stick of ram instead of the slot being bad, in this case the ram stick should cause the same problem all slots.

 

If you never get a stable system with just 1 stick of ram in 1 slot (trying all sticks by themselves) try removing all non essential hardware to get into bios:

 

Disconnect pci cards, pci-e cards - except a video card unless you have onboard in which case use the onboard video and pull the video card, hard drives, dvd drives, disconnect all usb headers as well. You should only have the power supply, main board, 1 stick of ram in 1 slot, the cpu and cpu cooler connected. You can also plug in a monitor and keyboard. Now try to power on the machine. If at this point you have no post screen or video etc, unplug the computer and pull the stick of ram, power back on and listen for a post fault beep code, you will need to hook up a motherboard speaker to hear any post fault code.

 

Double check on all of the capacitors, you can click the link below for examples.

 

While you have the computer apart, look for blown or bulging capacitors on the mainboard and video cards etc examples: https://www.google.com/search?q=bulging+or+blown+capacitors+motherboard&noj=1&source=lnms&tbm=isch&sa=X&ei=Iz_YU6aDLsS2yASnjoKwAQ&ved=0CAgQ_AUoAQ&biw=1031&bih=603 please report any caps you suspect may be bad, you can take a picture and post here if you are unsure.


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#5 JohnnyBla

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Posted 10 October 2014 - 04:49 AM

i have checked the ram. I don`t have any pci or pci-express cards. I had unplugged the dvd-writer and since then it seems that works fine. Can this solve the problem?



#6 zingo156

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Posted 10 October 2014 - 07:16 AM

A bad dvd drive can prevent post. It is possible that was the problem. Any component can cause problems.


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