External USB drive doesn't display

Hello,

My External USB Hard Drive do not show up in Win 7 64bit, Its working Fine on My Lapi nd other desktop.
By plugging it in there is even no more that spacial plug in sound, you know. Bu if I plug or unplug my USB Mouse there is a Sound an my Mouse works fine!

I checked in Computer Management, Disk Management and Device Management, its showing up on Device manager but its blank
I made several Reboots with the External Hard drive plugged an unplugged, nothing happend...
I tray to make an update on the USB Driver but it say it is already the latest Version intalled.
Even when I try to plug my HD into the USB plug were my Mouse was plugged in, nothing happend... When I Plug back in my USB Mouse, the Mouse is woking fine!

Same thing for my USB Hub as for my 2 External Hard Drives...
The External Hard Drives are not working even without USB Hub, same for the USB Hub without Ext.HardDrives.

I dont know what else to do?
Any idear?

Thank you!