Computer has no video signal and keeps restarting

MSI Z77A-G45 Thunderbolt LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
CORSAIR Vengeance 8GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) X 2
Intel Core i5-3570K Ivy Bridge 3.4GHz (3.8GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I53570K
COOLER MASTER HAF 912 RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case
No video card, attempting to use the video from the processor
I plugged in a hard drive, keyboard and mouse from another computer.
The new home-build computer starts but sends no video signal to the monitor, spins the fans and lights the LEDs for about 20 seconds, and restarts, over and over again.
Everything but the hard drive, keyboard and mouse are brand new.
I would expect to at least see something on the monitor telling me what has gone wrong.
Any ideas on what could be going on?

Quote
CORSAIR Vengeance 8GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) X 2
Corsair strongly advises against mixing two kits even with the same part numbers.
Does the HDD have a pre existing OS on it? Z77's default to AHCI mode, so if the OS on the HDD was loaded under IDE Mode, it won't work. Actually, if the OS is being migrated from another system, it is most likely not going to work correctly anyway. A fresh OS install is always recommended. But! This is moot if you can't get it to POST!
A key component is not listed, the PSU. What are the +12V amps?
Connect the monitor by another port instead of HDMI for testing. Also, remove all the RAM except one stick which is left in the primary DIMM2 slot. If still no POST, test with each RAM stick individually in the DIMM2 slot.
If the RAM has serial numbers along with the batch numbers, separate them back to the two kits. In case of RMA, they have to be matched up and the two kits separated anyway.

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Computer has no video signal and keeps restarting

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