i have tried for 2 hrs now to mount my phone with my laptop. tap usb connect, tap mount. turns it on, checks for errors, turns off. PC says enter a card in drive F. ive tried this multiple times. turned phone off, back on. turned off. removed batery, removed SD card, reinstalled all and turned back on. Restarted PC twice, turned off USB debugging. turned on USB debugging. NOTHING works. any ideas.