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You may have damaged your board.
Just because the 3rd gen processor may use the same socket as a 2nd gen processor, it does not mean you can simply swap processors.
For such an upgrade, the upgrade processor must be socket, BIOS, and chipset compatible. Only the manufacturer of the motherboard can tell you what processors their bios supports.
And, sometimes, you might need to upgrade the bios using the old processor BEFORE inserting the new processor.
Here is a comparison of your two processors.
How do I know if the motherboard is damaged or not?
I would go to the manufacturer site and look for instructions on BIOS recovery.
For an Intel board, such instructions are here: Recovery BIOS Update Instructions for Intel® Desktop Boards
If your board is not an Intel board, your next step is contacting the support site for your motherboard.
I would also try removing all power, and the coin battery, and wait 30 minutes. Then, reinsert the battery, apply power, and try booting.