Need to replace whole motherboard because CPU socket went bad
Luckily that is pretty easy with modern motherboards.1. Remove power and unplug all devices hooked to computer.
2. Open case.
3. Write down the location and orientation of all wires connecting to old motherboard.
4. Disconnect all wires from the case that are plugged into old motherboard.
5. Uncrew the screws holding the motherboard in the case.
6. Carefully remove old motherboard.
7. Install new motherboard and secure it to the case (probably using the same screws as the old MB)
8. Refer to diagram you made earlier to plug in all the wires to the proper places in the new motherboard.
9. Check and make sure the new motherboard works before closing the case.
10. If everything is working correctly, close up the case and you are done.
SOURCE: Dell sx270 optiplex
Its easy on most dells, open the case, disconnect all the cables and remove anything in the way, then just unscrew the boards fastening screws that hold it down. Sometimes its a single screw that holds the board in place, once removed, the board slides out. First try reseating everything, Pull out the memory and put it back in, same for the video card and any other devices, unplug it also and pull out the bios battery for 30 seconds so everything resets.
If the Capacitors on the mother board are swollen or have discharge, then the board is what went bad, The capacitors are the round black cyclinders that stick up from the board, there supposed to have flat tops, like tiiny little soda cans, but when they get heat damage or go bad, the get domes and split at the top and eventually rupture.
Here is the link to the dell site for the repair manual.
http://www.support.dell.com/support/edocs/systems/opsx270/en/sm/index.htm
You can also go to ( www.support.dell.com )
In the middle it has a link to MANUALS, then it has a way for you to look it up by make and model of your PC.
SOURCE: does msi motherboard P4M900M3 support
MSI has two boards P4M900M3-F, P4M900M3-L.
Both of this will support your CPU
SOURCE: need manual for l-nc51m motherboard
You did not mention which ThinkCentre model you are using, but I know that the Lenovo 3000 J115 is using this motherboard. Look at the hardware manual from Lenovo (link) and see if that is what you are looking for.
You can also try to locate it yourself (link)
If this is not the right one for you, just come back here and leave a comment with more details about your computer - I'm happy to help.
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