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Need to know where is the temp sensor located on dell press 390 and if it's not on the MB where can I buy one, because the computer stops each start-up telling me that there is no temp sensor ! for the box

I would like to know if MB 0DN075 WOULD ACCEPT A QUAD CPU AND IF NOT,

How can I replace the bios with one that will support a Quad core CPU, like the Intel 975xbx-2 M boards.