Finally got my final component this morning, I installed and and switched my PC on. It lived! I was so happy. I installed Windows, tried to connect to the internet to update drivers etc. Couldn't do it. I figured it could be the LAN driver, so I tried installing that from the disc provided with my mobo (and I installed a few other drivers too). So I plopped the disc in, and let it install while I went to town for like 30 minutes. I got home, found my PC off, but a light on the front was flashing (steadily, like 1 sec on 1 sec off). Since then it hasn't turned on (and the light has stopped too). Pressing the on button literally does nothing. Everything is plugged in and switched on, I've triple checked everything. What could be the problem?
Intel Core i5 4440
Corsair CMX8GX3M2A1600C11 XMS3 2x4GB
XFX Pro Series 450w
I've also tried taking everything out and shorting it with a screwdriver. Nothing. Also tried the PSU with a paperclip and it seemed to power up.