As well as what had been suggested above, here are some other simple diags to try and report back on...

When where you last able to successfully enter mass storage/pc suite mode and what were you doing at the time? (copying photos, updating software, etc...)

What was the last thing you installed or attempted to install? (Has anything failed to install since you last successfully connected the device)

Have you tried using another (Nokia preferably) USB cable?

Have you tried connecting the N900 to another USB port on the PC itself and does the n900 show as an external drive even still?

What happens if you plug the n900 to another PC?

Thanks



Edit: There is nothing strange about your USB problem is there. As originally suspected you have a failed installation... http://talk.maemo.org/showpost.php?p...;postcount=195