Windows 7: external hard drive doesn't show up on pc

I have a Seagate External Hard drive, Desk Goflex 3 TB.
I'm using it for sevral mounth in windows 7 and it's working fine.

Now, I bought a new latop using windows 7 as well, and it's not recognizing my hard drive.
The hard drive doesn't appear in the Disk Management at all.
The computer does recognize other USB devices (disk-on-keys, mouse).

I've read some old messeges but no one fits...

Hi Yanchu,

Welcome aboard.

Try this.

1. Plug in and turn on the external USB hard drive
2. Right mouse click on My Computer
3. Left click on Manage
4. Left click on Device Manager
5. Expand the USB list
6. Find the USB device for your USB Hard Drive
7. Right mouse click - Uninstall
8. Turn off the external USB hard drive
9. Turn on the external USB hard drive and let it find and install the driver
10. Does it work now?