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Have you change settings on your router? if not try to disconnect and reconnect your dell computer. if still not working. turn off both laptop, turn off the router and modem. wait for 10-20 seconds then turn on the modem first, and if the modem is stable, turn on the router, and if it is stable, turn on the dell computer and try to connect. If still fails, try to delete wireless profile adn recreate it. If still fails, check device manger if there is a problem in your wireless driver. If still cannot connect, perform system restore.
First thing I would try is to unplug the machine, remove the battery and clean the contacts on the battery and in the battery housing with a pencil eraser. Blow out the shavings and reinstall battery - the way it sounds is that there may be dirt or corrosion causing an interference between the computer and battery contacts - for charging and powering up.
This is directly from the User Manual:
If the computer is connected to an electrical outlet, the Battery light operates as follows:
• Solid green: The battery is charging.
• Flashing green: The battery is almost fully charged.
If the computer is running on a battery, the light operates as follows:
• Off: The battery is adequately charged (or the computer is turned off).
• Flashing orange: The battery charge is low.
• Solid orange: The battery charge is critically low.
Try to turn off the computer and remove the battery from the bottom of the notebook. Turn on the computer with just the charger plugged in. If it doesnt turn on. you may have a bad power port.
If it has no power/charging issue since that happened except that the indicator light doesnt turn on when you plug in the charger, you may just need a bios update. Click here. That's the bios update for the inspiron 2200 from dell's website. You should have at least 30% charge on the battery and the ac adapter should be plugged in so you can run it. The computer will restart and will come back normally after this. I'd suggest that you backup your files before running this.
I'm sorry to inform you that if that's how the lights acts when you try to turn your computer on, then the motherboard needs to be replaced. It could be caused by an improper shutdown or power failure. Call Dell and have it replaced if it still has a warranty. If not, then call Dell at this number 1800-2884410 to have an estimate on how much it will cost to have the motherboard replaced.