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Dell 1720 can't pick up wireless network

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Hi folks,
Hope someone can help me.
I have a dell inspiron 1720 laptop which until this morning ran on my wireless network.
The laptop reported an unexpected shutdown this am and since then I cannot get it to find the wireless network. (network is ok, my wife's laptop is still picking it up).
I have tried all the routines to connect but it just can't find any wireless network. Is there a button to switch the wirelss on? I noticew there isn't a light on the side of the laptop.
In the device manager all the network devices have a yellow exclamation mark against them.
I have even tried running a cable directly onto the router and this achieved zilch.
Yours, frustrated, and a little down too.
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    Mechanised Mod

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Is there a button to switch the wirelss on? I noticew there isn't a light on the side of the laptop.

There is a wireless on/off switch on the left hand side of the notebook, the LED should be permanently green if you have a good strong signal, if this does not resolve the issue you could try backing up all important data and then doing a System Restore "how to" below courtesy of MS;

1 Click Start → Control Panel→ System and Maintenance→ Back Up and Restore Center..
2 In the Tasks list, click Repair Windows using System Restore.
3 Click Continue in the User Account Control (UAC) dialog box asking for
permission to run the application.
4 Click Next in the System Restore window to view the most recent restore
points in chronological order.
5 Select the Show restore points older than 5 days checkbox to view the
complete list of restore points.
6 Select a restore point. Try to restore from the most recent restore point.
If this fails to correct the problem, try the next oldest restore point until
the issue is resolved. Any software installed after the selected restore point
will need to be reinstalled.
7 Click Next→ Finish.
8 When prompted, click Yes.
9 After System Restore finishes collecting data, the computer restarts.
10 After the computer restarts, click OK.
To change the restore point, you can either repeat the steps using a different
restore point, or you can undo the restoration.
If you encounter any error messages during the restore process, follow the
prompts on the screen to correct the error.
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