Im not sure if this fixed my v400 or not but all I did after uninstall reinstall, MPT's and pluging in unpluging, turning off turnning on I just created a profile when iopening MPT's and after that everything works. I connect perfectly in about 10 seconds and I can transfer anything back and forth. The one thing MPT's wont do that P2K does is let you delete any important files. With MPT's I cant even delete the standard ringtones cause it dosnt even show them. I cant see the number or name of people calling on my compute screen. kind of just says "incoming call" over and over.