Do you have the latest version of BIOS, A19?
• Intel Core i3 series
• Intel Core i5 series
• Intel i7 Quad Core series
But It may not support all i7 CPUs. The i5 2400 is Generation 2, and the i7 3770 is Generation 3, so this may not work. Do you know if they both support the same Intel Chipset?
With i7 installed, remove motherboard battery and press/hold power button for ~30 sec. Reinstall the battery and see if it boots now.
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