I have a Pavilion DV7-4020sa bought mid-2010 which would not start on 1st Jan 2014. The Caps Lock light blinks at about 1 second intervals and the orange light on the F12 key is on permanently. There is no screen display at all and initially a short burst of activity from the fan then is cycles with the Caps Lock Light. There is a white Led lit on the On/Off switch and an orange one alongside the power cable input and an orange and a white adjacent to the 2 USB sockets on the right side front corner.
No amount of switching on and off nor battery removal and other voodoo type tricks have any effect.
The notebook has been one of the mainstays of the life of a severely handicapped cerebral palsy victim and although it has now been replaced by a Rove 20 could still do stalwart service if it is repairable.
I have not been able to find a specific answer to this blink code. Please advise.