I had the error code OX83C00009 NOS_LOADER_APP on my HP Officejet 4630 & this is how I resolved the issue.
Pulled out the power cord -
Waited 30Mins -
Pressed the On button and the Home button at the same time -
Pushed the power cord in whilst holding the two buttins in -
Waited until the printer started to make some clicking noises -
Lifted fingers off both buttons after about 5 seconds and
Bingo - it sprang into life..............