About Upgrading Power Supply

[gjwnsdn5]

Hi guys.
I just want to know the reason why my desktop isn't working.
I bought two G.Skill Sniper DDR3 1866MHz 8GB (4GBx2) Ram to add more rams into my desktop.
After I installed these rams, I turned on my desktop.
Well it works ok. There was no problem with desktop but my keyboard, mouse, monitors didn't work.
Do you guys have any idea what is going on? Do I have to get other PSU to solve this out?!
P.S. I want to overclock my CPU. It will be great if you recommend me one.

Specs
CPU: AMD FX-8350 4.0GHz 8-Core Processor
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Motherboard: ASRock 970 EXTREME4 ATX AM3+ Motherboard
Memory: G.Skill Sniper Series 16GB (4 x 4GB) DDR3-1866 Memory
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
Video Card: MSI Radeon HD 7870 GHz Edition 2GB Video Card
Case: Corsair 200R ATX Mid Tower Case
Case Fan: Corsair Air Series SP120 High Performance Edition (2-Pack) 62.7 CFM 120mm Fans
Power Supply: CoolerMaster Thunder 700W Gaming Power Supply 85% Efficiency PSU Cooler Master
Optical Drive: LG GH24NS95 DVD/CD Writer

 

[syked3]

PSU doesn't seem like its the issue. Make sure, you haven't knocked any power cables loose and ensure the RAM is seated correctly. Try booting the system with the old RAM and see if boots. Then try it with just the new RAM. Also, make sure you are inserting the RAM into the correct slots (check manual). You could also try booting the PC without any RAM sticks, and listen for a beeping sound from the motherboard, if it beeps then its ok, if not then its dead.
In terms of your PSU, 700W is enough for overclocking but if you'd still like a recommendation then let me know