Okay ... have searched hither and yon and have not found either this particular problem hence no solution:
A DV7-1245dx that continuously cycles hd/cd drives but doesn't complete the bios process. All leds light up and there are no blinking lights to indicate a problem. There is no normal bios response on either the display or an external monitor. Have gone through the hard reset, reseating of memory, removed (and reinstalled) cd drive, tried swapping hd with one from an exact model functioning DV7, removed all usb devices, etc, etc, etc. In other words, have tried any and all "solutions" on the forum.
Short of replacing cpu or mb or sending it in for service, might someone out there have a solution for this particulor problem?