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A good power supply that will supply 5 volts and at least 1 amp (5V 1A) is vital.A 5 volt 2 amp power supply can help some wifi USB adapters run more stable.
This can be done from a Windows PC, which should show several files in the FAT partition on your SD card including bootcode.bin, kernel.img, and If you are reading the SD card from a working Pi, you can edit the file with sudo nano /boot/Text appears on screen, but then hangs with debug messages.They should be 5v 100m A each max, any more than this they must be used with a powered USB hub.Try unplugging every USB device except the keyboard (you should also note that some keyboards have built in hubs and can try to draw 150m A (Pi can only handle 100m A per USB slot without a hub)). Forum user Mr Engman reported some keyboard repeats and wireless hangs until upgrading to the debian6- kernel, which he reports stable with no problems even with a low TP1-TP2 voltage of 4.65 - 4.68 volts.My experience regarding this issue point to interferences in the 2.4 GHz frequency band in which both Wi Fi sticks, as well as USB keyboards transmit data.Changing the channel on the wireless access point fixed the problem completely.
On 2012-05-12, user spennig was pleased to confirm that wifi was working with a USB keyboard and mouse, as long as the Raspberry Pi had a good PSU and a powered hub. USB Wi Fi connected to the device, and the keyboard and mouse connected to the powered hub.