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RE: Dell t5500 workstation diagnostics lights 2 3 4 blinking no display

Similar issue here (although they're reporting power light is Amber) - could be CPU or CPU/riser not fully seated.  I'd try to reseat and/or run with a single CPU to isolate. 

Would be nice if LED codes for T5500 were complete at Precision T3500/T5500/T7500 Workstations Diagnostic Lights and Beep Codes (if your power light is Green and 2, 3, 4 flashing, then your pattern isn't listed).

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