Freeze on POST with constant beep

Dell / Dimension 9150
June 30, 2010 at 15:44:04
Specs: Windows XP
My Dell Dimension 9150 worked well
yesterday but today when I turn it on it freeze
during the POST, the status bar under the Dell
logo on screen go up to 95% more or less,
emit a constant beep and the Diagnotic Lights
1 and 4 light up.

I unplugged the keyboard, mouse, HD, DVD,
monitor and video card and I still get this error.

Any idea?

See More: Freeze on POST with constant beep

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June 30, 2010 at 18:19:40
1+4? Oh great, that doesn't show up on here:

I'd pull from the board: RAM, PCI devices, Video (if applicable), HDDs, Optical drives, Check the MB for bad capacitors:

...and leave PSU attached, then try booting system, note what happens with diag lights and beep codes.

- Power down, then Add 1 RAM module, note what happens with diag lights and beep codes.

- Power down, then Add other RAM module (if applicable), note what happens with diag lights and beep codes.

- Power down, then Add video, then PCI, then HDDs, then Optical drives ---- all noting what happens with each one you add.

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June 30, 2010 at 19:18:07
Yes I know the 1+4 combinason isin't listed on the Dell
website, that's why I'm a bit confused :).

I have remove all cards (PCI and AGP) and unplugged the HDD
and DVD, all at the same time, and still got the same high-
pitch constant beep and 1+4 diag lights.

Removing the RAMs, one at the time, still give me the same
beeping / diag lights.

When I removed the last RAM only the diag light #1 light up
and I dont get the high-pitch constant beep.

All the capacitors seem ok. The only thing I can suspect is the
CPU but I don't have a spare one to test it, and I'm pretty sure
it wouldn't start to boot-up and show the Dell logo if the CPU
was the problem.

Any other idea?

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July 1, 2010 at 07:45:34
If there's no RAM in the system, and upon booting up it does NOT beep, AND the #1 light IS lit, that's a good sign. If putting the RAM back in gives you a beep, you might have a memory issue there or a memory slot issue.

I'd blow out the memory slots with compressed air, inspect the slots for damage, inspect the RAM modules and their metal contacts for damage then try another, different stick of RAM in there if you have access to one.

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Related Solutions

July 1, 2010 at 11:47:41
Thanks for your inputs.

I have 2 RAM. I've clean the slots on my MB and tried both RAM
alone with the same result twice: long beep and diag lights 1 +

I'll try to find a RAM that I know is working properly and test it
again, but I'm afraid I'll get the same result :(.

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July 1, 2010 at 11:55:21
It's rare that RAM fails. Having both of those RAM modules be faulty is very unlikely.

What do the Power lights look like during troubleshooting?

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July 3, 2010 at 10:20:35
I found the source of my problem!

Some dust had accumulated into a USB port on the back of
the computer and made a short. Cleaning it fixed the problem
and now everything is working fine!

So constant beeping + diag light 1 and 4 can equal to faulty
USB port... who knew?

Thanks for all your time and inputs!

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July 3, 2010 at 13:22:34
Dust causing electrical shorts? Hmmmm. Maybe metallic dust, but I don't think normal household dust would do that. Oh well.

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July 3, 2010 at 13:27:03
"Dust causing electrical shorts?" Think moisture JoseyWales.

Audares Juvo

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