ASUS Transformer TF300T Stuck at ASUS Logo and cannot enter into Fastboot topic

Hi guys,

I tried to flash Cyanogenmod, but must have done something wrong because now my tablet is stuck at the splash screen with the Asus logo and I cannot use Fastboot to select a usb (I cannot do the Power button+volume down button method). How can I restore fastboot access? Also, my computer won't recognize my tablet, so how can I restore access to that as well.

Thanks!