...oh god...

wobbly USB! I beg you, TEST IT NOW. If there is ANY doubt over how solid the USB plug is SEND IT BACK RIGHT NOW. Holy **** man. Wobbly USBs is what kills N900s and it would be a real bummer if your 'refurbed' unit had a 'ready to break' USB port. I cannot stress this enough, CHECK THE USB PORT while you are still in the 10 day return period.

If the USB goes you will have a very expensive electronic disappointment.

Also, before you get to attached to your current set up, do a complete FULL reflash. I have never come across a vendor who understands how to properly flash an n900. Even if you connect it to PC suite and click 'reload software' or whatever it is called, this is not a complete flash. You need to flash emmc & rootfs (you will understand when you read the link above).

So in conclusion:

1. COMPLETE RE-FLASH!
2. Check USB port.

If problems still persist, get that **** sent back!