My computer does not connect anymore to my airport express

i have an airport express for years and since a few days my computer manages less and less to connect to it. it sees it in the available networks but it does not connect to it automatically and when i try to join it with my password it fails to connect as well. when i go to the airport utility and scan for available devices it does not find it. i can connect through a direct ethernet cable to my cable modem so it's not my internet provider the problem. when i turn on the computer it sometimes gives me the signal that the airport device is on (the little fan) but as soon as i open a browser it greys with a little exclamation mark.
any thoughts on what i could do? would a factory settings restore solve the problem (last resort as i would have to remember all the right settings that have to do with my internet provider plus passwords for station and joining networks, grrr)?

Aimée Z. wrote:
since a few days my computer manages less and less to connect to it.
If you unplug the AirPort Express, wait a short time, then plug it back in, does it work better (at least for a while)?
would a factory settings restore solve the problem
If you can get AirPort Utility to recognize it at all, use the menu option File -> Export Configuration File to save the configuration settings. Then you can do a factory reset followed by File - Import Configuration File to reload those settings.
There's a chance that it would help to reset the connection settings on your Mac using these steps one at a time until it works again, recognizing that, depending on your problem, not all of these steps will make sense:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) Try to select your Wi-Fi network from the AirPort menu.
3) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
4) In the same panel as (3), define a new location and see if you can make that work.
5) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease".
6) In the folder /Library/Preferences ( not <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.
They may not help, but they'll only take a couple of minutes to try. Before you try these, if you have any special network settings on your Mac for things like DSL credentials, note all your network settings, because the latter steps will destroy them. If you got all the way to the last step, if things don't work any worse than before, you can trash the saved SystemConfiguration folder.

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