Problem with SD card and internal storage-pls help

After installing a custom Android 2.1 ROM, my Archos Arnova 10 tablet cannot recognize SD card nor its internal storage. When plugging into computer via USB cable, I can still access my SD card -- but I can't see the internal storage from computer. Have tried re-formatting SD card many times but it didn't work. Is there any way I can put my internal/external storage to work again? May I flash a new ROM without using the SD card? Or I guess a mount command may help to mount the SD card? Please help.

Really appreciate any recommendation since I'm desperate. Thank you!

P.S. Already root my device with su and terminal emulator.

Ok, nobody answered. Well, I will put my 2 cents in...

Keep in mind, I do not have a tablet, but android is android....

In a lot of cases.

1st, why did you downgrade?

2, Did you do a backup of your previous ROM?

3. When you flashed, did you wipe all cache memories? Before flashing?

4. Can you now boot to recovery? If you can, you should be able to mount your sd card. Maybe..

Hey, dude. I have a Droid X. That's good that you can see your SD card and its contents from your computer. I am not aware of a way to view the phone's internal storage from a computer. Try searching in the Android Market for "file manager" or "file explorer." I use Root Explorer, although there are probably lots of free file explorers.