Case: Corsair Carbide 400r
Motherboard: GIGABYTE GA-Z68X-UD3H-B3
Processor:Intel Core i5-2500
Memory: Corsair Vengeance 8GB DDR3, 2x4096MB
Graphics Card:MSI N560GTX Twin Frozr II/OC GeForce GTX 560 Ti
PSU: Corsair CMPSU-750TXV2 Enthusiast Series TX750 V2
I also have a sound card installed, an optical drive and a hard drive, but don't think any of those are related.
Anyway, using the manuals a youtube video for guidance, I installed and connected everything. When I start up my system, however, all the fans go on and the green, orange, and red LEDs on the motherboard light up, but I can't get anything to come up on my monitor. I just get "no signal." I know it's not the monitor, as I tested a different one with the same result and also tried this monitor on a different computer and it worked fine. The USB seems to work, as my keyboard powered on when I turned on the system, though I'm not sure if that's relevant.
Double-checked all my connections, can't find anything loose or missing; tried the RAM in different ports and with only a single stick with no change; Reread through my mobo manual and can't find anything helpful.
I'm feeling pretty discouraged and lost as to what to do next. I'm really not sure what the problem could be unless the RAM either is faulty or got fried somehow. Neither the mobo or case had an internal speaker included, so I don't even get any beeps to go off of. I've ordered a speaker (and if I get impatient may go out and get one), but I'm not sure how much it'll help.
Any advice would be very much appreciated. Thank you!