Its blinking because it charging. Try this, turn off the ps3, turn the controller over and use a needle or tooth pick and hit the rest button. Turn the system on (not with the controller) plug the controller in with the usb and re-register the controller. Let it charge before unplugging.
i'm having a similar problem. however, even when i connect the controller via usb to my system it still keeps blinking. it also cant turn on the sytsem. and this happened one day ago and owned the system for 6 months. I dont know wat it could be.
i'm experiencing a similar problem
3 of my controllers work fine, but the fourth does not and i need to use all four at once
it does not turn on the ps3 when it is on standby and i press the ps button
it is not recognized when i plug it in via usb
it is not recognized when i press the ps button or plug it on when the system is on, either