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Solved!
Go to SolutionDell Optiplex 755 CPU Problem
Hello, I was told in one of the forums that a Intel CORE 2 QUAD PROCESSOR Q9650 SLB8W 3.0GHz 12M CACHE 1333 MHz FSB would work in my Desktop. I purchased it on E-bay and installed it with the already upgraded bios A22. It did not work. I tried to install my original that did work and now I cannot get it to even post. I have removed the battery for an hour and that did not help. I tried a different video card in case that was the problem. I get absolutely nothing on the monitor. I am at a loss. Does anybody know a trick or two to get it back up and running. Thank you very much for your time. Robb
- Hello When the computer starts I get nothing on the monitor at all ! No post no nothing. Also I get no error messages or no irregular lights flashing that isn't normal from when working normal. It sounds like it's booting but no video. I have already installed two other video cards to see if that was the problem and no go. I put everything back to oem. No unusual lights no boot post. Sounds like the hard drive is working everytime I reboot. I'm at a loss. I have removed the battery for an hour and that did not help, I have not tried setting cmos yet by jumper. Thanks for the replies. Robb
- Thanks for the reply, I have purchased a Intel Core 2 Duo E8500 3.16GHz/6M/1333 Dual-Core Processor SLB9K. I was told this will work and I sure hope so after already buying two others that will not work for the sum of $150.00 already spent and another $30.00 spent for this one which is more than fair. But as you know these are really a work horse computer with an outstanding lifespan. I hope it's worth all the effort as I am going to use it daily around the clock 365 days a year to run my security system GV-1120. The best to all of you. Thanks for everything. Robb
Based on this I would've done the very same thing, [taking a chance that lack of a newer Dell BIOS update may cause CPU to not be recognized]
Intel® Processors and Boards Compatibility Tool:
Found 85 Compatible Processor(s) for Board "DQ35MP
Intel® Xeon® Processor 3000 SequenceX3360 2.83 GHz 12 MB 1333 MHz
Intel® Core™2 Quad Desktop Processor
Q9650 3.00 GHz No 12 MB 1333 MH
spec - SLB8W
Intel® Core™2 Quad Processor
Q9550S 2.83 GHz 12 MB 1333 MHz
Q9550 2.83 GHz 12 MB 1333 MHzIntel® Core™2 Extreme Desktop Processor
X6800 2.93GHz 4 MB 1066 MHz
osprey4
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34230 Posts
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Posted June 13th, 2014 12:00
What POST error or diagnostic lights do you get which indicate an error?
Here's your manual: ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-755_user%27s%20guide_en-us.pdf
You might try clearing the CMOS.