So I've just got an S2600COE with 2x Xeon E5 2620 v2 and 8x4GB ECC registered RAM.
But it will not get part POST, it beeps with 1-5-4-4 and 1-5-4-2 which indicate a power supply problem.
Problem is I've tried 3 different (working) power supplies (all rated 80 plus, with enough current) and this is the second motherboard too.
I've tried all the usual fixes, 1 stick of ram, 1 and 2 CPUs, all sticks of ram, then just 2 sticks, reset CMOS.. nothing worked, so I'm wondering do I need an Intel branded power supply, is there something missing in normal desktop type power supplies that stops it from booting?
I work with HP servers at work and have used desktop power supplies in servers before without a problem, so this really has me stymied.
You've tried it with nothing in the PCIe slots too, I'm guessing?
What brand of chassis/power supply are you using?