You need to make sure you have the current BIOS installed. www.dell.com/.../DriverFileFormats Have you tried switching the processor positions? Try moving the processor from slot 1 to slot 2 in order to isolate the issue.   Are both processors allowing the server to boot in slot 1 if you try them one at a time?  That would verify that the processors are working properly.    Are there any noticeable bent pins on the slot or processors? Let us know if you have any further questions or concerns. Dell | Social Outreach Services - Enterprise
Hello, we have had a PE2900 that came with a single proc and a PE1950 that came with 2 procs. The procs in the 1950 are much better than the 2900, and so I called our Dell reps and asked if we could just move the procs over from the 1950 to the 2900. They said that we could, so I ordered a second heatsink for the 2900 and moved the procs over. Once in place, I get a error code, E1410 CPU 2 IERR. When I only have 1 proc from the 1950 in, it works great, but it's when I add the second proc from the 1950 that I get the error and can't boot. Is there anything I need to do for it to accept the second proc? Jumpers or anything like that?   Thanks. -Jason
PE2900 Adding Second CPU