computer won't detect sansa clip mp3(on any system)

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http://crunchbanglinux.org – I own a rockboxed sansa clip+. Until recently it connected fine to any computer, but recently neither statler, ubuntu 10.10 nor xp could detect the device. I think the issue started after I filled the sansa full(there was about 900kb left) and after OF refused to boot because of that, and when connected to computer- it would be detected and then disappeared after a moment. Then I removed some of the files using rockbox firmware- without connecting the player and sansa remained invisible since.I tried what is essentially the only advice on rockbox/sansa forums- switching usb modes, to no effect (HowTos)