Question : Blinking light on laptop ac adapter

I have a Sony Vaio VGN-CR220E. The light on the ac adapter glows bright and then dim. When it is dim the icon that shows the power condition switches to battery power, when it is bright then the icon shows it is back on ac. With the adapter not plugged into the Vaio the light glows brightly. Has anybody seen this before?

Answer : Blinking light on laptop ac adapter

I found out that the ZTE MF112 presents itself to Windows as a standard modem and that I can use the AT+CSQ command to find the signal strength.

Thanks anyway