After I upgraded my computer which one currently having a ASUS Maximus VII Hero motherboard and Intel 4790K CPU,
Every other time I cold boot up my computer, I have to unplug and then plug back in my webcam which is Logitech C270,
for it to be recognized and to work. Otherwise it is not detecting at all after I bootup my system.

But no problem when I am using this camera on my old laptop. Or any old computer...

I have contacted Logitech and they told me to disable xHCI from the BIOS. I have already done that but that's not worked....

Further information can be found here:

http://forums.logitech.com/t5/Webcams/HD-Webcam-C270-Not-Detected-After-I-Power-Off-And-Boot-Up-My/m...

They then told me to contact ASUS... Please help me... My BIOS is already up to dated (3003)...