No signal to monitor What is the cause?

I recently had a problem with my PC not even starting so I took the components all out and re connected everything outside the case (On an anti-static mat) and the computer started but now their is no signal to the monitor have Tried PCI-E, Clearing the CMOS, Moving the ram But have not move the processor because when I first put it in the pins got bent but they have now been fixed. Realllly need this fixed before January the 18th :??::(

Please note I'm only 14 and don't have loads of money to spend on components

Motherboard H81M-E
Processor i7 4790
Ram Hyper x Fury 1600 Mhz 4gb
PSU CORSAIR VS550
CASE Commandar MS-II