External Hard Drives not Mounting after Upgrade to Lion

[ghsusaxa75]

I just upgraded to lion on my trusty macbook pro 2007, but now I have having troubles getting my external hard drives to mount. The external hard drives are windows formatted and worked perfectly fine when I was running snow leopard. Now, when I plug in the external drives, they don't show up in the finder. When I load up disk utility, the computer identifies the hard drives but doesn't allow me to mount them. The hard drives themselves are ok since I can mount them on a windows computer. When I plug in a mac formatted external drive, the computer mounts it with no problems. Does anybody have a solution to my problem?
Thanks in advance

 

[chscag]

Are you able to see the drives in your Finder sidebar when you mount them? Make sure in the Finder preferences, Sidebar, that you have the Hard disks and External disks items checked.

 

[ghsusaxa75]

I am unable to see them in the Finder sidebar. Under the finder preferences, it has hard drives and external disks checked.

 

[waxwing1]

Mount Disks via Disk Utility

Not a solution but a possible stop gap. Open Disk Utility and see if you can manually mount the discs. I have the same problem but can do that. I called Apple tech support, created a new user account, the disks mounted, went back to original account and they were still mounting automatically. A few days later my machine rebooted due to a power surge and now they don't mount automatically.