Might be cmos battery too low voltage, or bios chip seen its best days. You might try reflash the chip, look exact model number ( i guess its DV6-1299us there is no model dv6-129us) download latest bios. Before flashing check that your battery has atleasst 30% charge and power cable is plugged in, disable your antivirus until next boot. Continue with flash, this is your own risk, if bios chip is already damaged you might freeze during flash.
Usually these dv5-6- and 7 series are flooded with ati readeon chip failure, however this suggests other thing. I actually would just replace the cmos battery and if that wont help then weigh in do you want to risk the flashing or just wait 30sec for the splash screen.