I have a custom built PC w/ Windows 8.1, Corsair CX750 PSU, Intel Core i5-4760K CPU, MSI Z87-G45 Gaming Mobo, EVGA GeForce GTX 760 graphics card, Crucial Ballistix Sport 8GB Ram, and it will not power up. When everything is plugged in and I press the power button on the Corsair Carbide tower, it does absolutely nothing. I think I had a power surge that affected it last Friday. The computer has worked fine since 11/2013, and all of the sudden wouldn't power on after the power surge.
I started a warranty return w/ Corsair and they told me to try the paperclip test. I bridged the connector and got the fan on the PSU to spin and also a hard drive to spin. They're telling me that means the PSU works fine, but I'm not sold - I've seen elsewhere that sometimes if they're fried they can power small things but not an entire system. I've started a warranty return w/ MSI but I'm concerned it won't be the Mobo and I just wasted time and money waiting to hear that, or that they may not warranty it when they see one or two of my screws during installation slightly dug into the Mobo. Although those screws have not impacted the system in any way for 1 1/2 years, I'm worried they may blame that damage and refuse to warranty it.
How do I troubleshoot to see for certain if it is the PSU, Mobo, or something else?
Edit: Using another computer to swap parts in and out to see what is or isn't working of is likely out of the question. I don't have any other PCs around and know almost no one in the town I live since I recently moved here.