HTC One connected via USB-Not recognised

OK, just got a new phone, HTC One.
I have my works Blackberry paired up via Bluetooth and used to connect my iPhone 5 via USB to access music, I want to do the same with my HTC.
The HTC One is not being recognised at all via the USB input in the centre console, it charges OK, but does not appear under the my music on the screen. Have tried turning off power saving on phone etc.
Anyone had the same issue, any help appreciated.

It does not act as a usb flash drive anymore, try this

1. Open the Settings app.

2. Go to the Connect to PC section.

3. You can choose from the following options:

Disk Drive (use as USB drive)
HTC Sync Manager
USB Tethering (for 3G dongle)
Internet Pass-Through