Today I received my Asus Xonar DG Soundcard from Amazon. I read in the manual for the card that I should disable my onboard audio, so I booted into my Asus P8Z77-V's UEFI and disabled it. I installed the audiocard, plugged everything back in, and lo and behold, no response from the computer. I removed the soundcard, and again, no boot. I even removed my videocard, and all SATA drives and fans, so only the power connectors and case switches remained plugged in. Still no response. I'm inclined to believe that my case (a slightly modded Cooler Master HAF 912) has a broken switch, but I'm not sure, since I got the case just last year, brand new. Any help?