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Which CPU's will A Dell GX280 MB ser # CN-OH726 support

I replaced a damaged power supply and Motherboard on my Dell Optiplex GX280 P4 3.6GHz Mini-tower. The 4 prong 12V power connector had a fried pin (molten and blackened) on it when I dismantled the PC.
I got a new power supply and located a MB taken from a GX820 and attempted to utilize it as a replacement.
The new MB, Ser# CN-0H7276-13740-56F-01XG powers up and reports that the CPU is not supported.
Is there any way to determine which CPU's can be supported or would resetting the BIOS allow the CPU to work?
The physical configuration (3 PCI slots, 1 PCI-e, 2 SATA etc), the sockets (LGA775) are all the same as well as the intel chip (FW82801FB)

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  • travlin_man6 Jan 25, 2009

    Sorry, the new MB was taken from another Optiplex GX280 (unknown configuration).

  • travlin_man6 Jan 25, 2009

    This is a FOXCONN MoBo (LS-36 per the sticker on the board) and does come up on a search at the FoxConn website.

    Typically there is a range of processors that will function on a motheboard but may require a change in setting (voltage jumper, clock speed, etc) in order to function. I am looking for any information on this board from Dell that would help me determine what CPU;s will work and any specifications available.

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The CPU must match the motherboard. You can go to the MOBO manufacturers website and find out exactly which CPU fits on that model. Without that information from the manufacturer you may fry something on the board.
Don't forget to rate this solution before logging out.

Posted on Jan 25, 2009

  • Randall  Trahan
    Randall Trahan Jan 25, 2009

    Go to www.hardwaresecrets.com

    They have good information on tricks to find motherboard types and many other things that may help you.


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Dell optiplex GX280 tower machine, pc reboot again and again, fan run so fast and make alot of sound, also power light blink red instead of green, i have changed rams but facing same problem, what sho


Hello here is the home page:

http://www.dell.com/support/drivers/us/en/ussoho1/Product/optiplex-gx280

I think you have some kind of a virus or malware on your system.

Install this program and make a full scan:

http://www.malwarebytes.org/products/malwarebytes_free/

You maybe have to start the pc in failsafe mode by pressing F8 while you reboot.

Install also a better FREE antivirus program:

http://www.microsoft.com/en-us/download/details.aspx?id=5201

Please uninstall any other antivirus programs before you install microsoft security essentials. Run a full scan when installed and updated.It`not great to have more than one anti virus program installed. Most antivirus programs have a background scanner running to protect you from virus vhile you surf on the internet open a file etc.With more than one antivirus program the pc`s performance will be decreased.

There are a lot of things that can cause a computer to shut down.This could also be the power supply.Try also to renew the thermal grease between the cpu and the fan but BE CAREFULL not to damage the cpu.
If you are unsuccessfull at resolving the problem visit a computer repair shop.

When you talk about checking memory, it's the physical RAM stick inside the computer. RAM does not have sectors like a hard disk drive. If it does happen to be bad I'd replace it with at least 1GB to 2GB. 512MB is really low.

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eykraus,
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refer to here
http://en.wikipedia.org/wiki/Capacitor_plague

As this was a common problem with the GX280.
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