Mate, I have just had the e-8709
After unplugging my USB stick without pressing USB stop.
The cdj 2000 was connected to another cdj 2000 with network cable and tracks where in the tag list...
My 2000's where bought in 2010 and come with a 4 year waranty... So ive contacted my seller and they where very happy to help and put me on contact Pioneer.
Pioneer have confermed the cdj is lost in information after i unplugging USB with
Out pressing stop....
I have to send it off for a service/factory restore as customers have no access to the main reset/utility options :(.
You blank screen issue hopefully is an easy fix here us the contact for pioneer I used
01755 789 789
You could try making sure all ribbon connections just under bottom silver casing are pushed in properly (be very carefully with clean dry hands) working gloves are a good idea...
All the best