I keep losing my connection from iMac to keyboard and mouse any help please

I keep losing connection between imac and my mouse and key board.I then have to power off and reboot to get connection can anyone help please!!!!

Hi
Update date for anyone who ha suffered with the problem of losing connection to an ext HDD.
For me, the solution appears to have been achieved by making use of my old 802.11 b&g Airport Extreme base station and my new 802.11 n Airport Extreme Base Station.
My network is now setup as follows:-
Airport 802.11 n - 5GHz
Macbook Black
Apple TV
Time Capsule
Airport Express Base Station
Airport 802.11 b&g - 2.4GHz
Playstation 3
Xbox 360 Elite
Nintendo Wii
iPhones
iPod Touch
Canon Wi-fi Printer
iMac G5
Sony VAIO TX2P
I connect my ADSL line to both AEBS by ethernet, changed the settings and this has dramatically improved my connection reliability and speed when streaming movies and/or music.
Through trial & error, I have also discovered that the other problems that I have are connected to situations when restart my Macbook after a shut down or restart and my iPhone is connected. This causes iTunes to start up but due to the restart, the ext HDD is not ready and therefore, ITunes opens its local library - I now just try to remember to use the Option key to choose the library. Finally, if the laptop just runs out of juice, the ext HDD doesn't have the chance to have a friendly handshake before losing its connection. When I restart, the connection does to the HDD fails and I have to restart AEBS
I hope that helps anyone with similar problems or who wants to make the most of their fast 802.11n equipment by making is use of that kit that was maybe considered redundant - by creating a dual frequency network that maximizes speeds on 802.11 n whilst allowing use of the legacy 802.11 b&g devices.

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