If you have placed another processor on your board and this is working, it might be a defective processor.
Are you looking for warranty on your processor?
Please contact Intel support at: Contact Support
its i5 2nd 2400.
today, i have try xeon 1230v1 has no GPU inside, and that still doesn't work, but pentium 2nd good. with xeon, just 4x slot on mainboard.
i tired with my money and my time