Having problems with your Dell Optiplex 755 Energy Smart Minitower Intel Pentium Dual Core Processor E2160 ?

Dell Optiplex 755 does not boot. The steady yellow light on the power switch comes ON but no other error codes on front panel. Machine powers up for few seconds with Yellow light and powers down then wait few seconds then the same thing happens over and over. I isolated the fault to the mother board. but do not know where to start. Replaced the processor and RAM still the same. Thanks for yor help in advance.


Answers :

I have the same issue, in my case, in some Dell's I get a loud FAN noise as well, so far except for the FAN issue replacing the PSU had no effect so I think it is the MB/Proccessor. Recently dusting out the Processor worked on one of the mis-hap Dells which has thuis issue. I personally think Dell tech's should look into this and post some working base solutions!
I work at a college and had this same error with a nice few of the Optiplex 755's. However it was due to the power supply failing, nothing with the mother board. Have you tried replacing the power supply?
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