I have a Precision T7500 (2 E5540 processors) with 6GB of memory and upgraded the memory with 4Gb more.
After I installed the new memory, the computer would power-up but not boot. I took the new memory out, leaving only the memory that was in before the upgrade, and it still has the same problem.
I did a CMOS reset, but it didn't help.
I took all the memory out and started with 2GB only (1GB on MOBO and 1 on riser). Same problem.
I changed the 2 sticks with 2 of the others but it didn't help.
I tried with 4GB and the problem remained.
I'm following the manual's instructions on where the modules have to go.
The diagnostic lights are: lights 3 and 4 are on (memory failure); but the workstation is only two months old, so I don't see how all the modules would be bad.
The original memory is Elpida PC3-8500 (1066Mhz) DDR3 DIMM ECC (unbuffered). The description on the module is 1GB 1RX8 PC3-8500E-7-10-DP.
The new memory I got is the same as above but made by Centon (the code on the module is totally different).
Thanks for any help.
Try resetting the CMOS with the original RAM modules installed.
Also, I think you're far better off posting in the desktop general hardware forums.
Thanks for the reply.
I did reset the CMOS with the original RAM only.
I also tried taking the MOBO battery out for about 20 seconds while resetting the CMOS.
When I did that, the computer wouldn't not power up anymore.
I called tech support of the place where I bought the memory. The tech suggested that I tried starting with just 2 Gb on, and then add by increments.
Then the computer powered up again. He was very helpful and looked up the diagnostic page on the Dell manual, but couldn't find a solution.
Thanks for the suggestion about posting on the general hardware forum. I'm going to do that.