i recently bought a mk4 from a friend of mine, but i ran into a few problems.
i installed the drivers correctly, and the lights would light up on the controller. the controller would also show up in the mappers for virtual dj pro 7.
the main problem now is that the lights on the controller wont even light up anymore. i checked my device manager and now its listed as an "unknown device" i have tried reinstalling the drivers many times. i have tried different usb ports. i have tried connecting it while holding the mic on/off button. also the hercules dj series control panel shows an "x" on the icon. the first two choices are also unavailable.
im thinking that its a problem with the controller itself, but i hope it isnt since i just blew $100 on it =/
help?! 
Anyone???
Indeed, from your description, it seems like it might be a hardware issue.
That's what I was afraid of =/
Just hope my friend still has a warranty on it.
Thanks!!
