Either the power supply is faulty , maybe some electrolytic capacitors need replacing. Or perhaps the EHT High Voltage feedback loop to it is inoperative due to a gradually failing state of one or more components in the Horizontal drive or Output stages.This is not a job for a non-technician and needs checking out by a Technician with the right test equipment ot analyse the problem and find the fault/s and fix it. Dangerous voltages exist which could be very harmful if not fatal!
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Fault with main board. Shorted component/s. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
it sounds like Amp burned, but not all burn parts you can see, you have to measure them by DMM. I guess at least one AMP transistor shorted. you can check SPK terminals by DMM DC, it can be easy to find different with other one
I got similar issue and managed to fix it with excellent tech support from NAD. Flashing LED means system goes in to protective mode. Most probable reason is presence of DC voltage on amplifier out puts. In my case it was both surround amps. It had faulty resistor and a dry jpint at power line
You can try to reset the Printer to factory settings.Just follow the below steps, dont worry my steps will not mess your printer , as i was HP tech support for All in One printer for 20 months.
POWER DRAIN:-Turn off the printer, Unplug the power cable from printer and from the wall outlet.Press and hold ON buton for 30-60 seconds.
PARTIAL RESET:-Unplug the printer power cable while its ON, press and hold # and 3 button and connect the Power cord while holding.Wait for 40 second then release the buttons.
----(for below reset cartridges must be removed out)---------
SEMI_FULL RESET:-Unplug the printer power cable while its ON, press and hold # and 6 button and connect the Power cord while holding.Wait for 40 second then release the buttons. Push the ON button and check.
FULL NVM RESET:-Take the Ink Cartridges out, Unplug the printer power cable while its ON, press and hold ENTER/OK and CANCEL button and connect the Power cord while holding the buttons.keep Holding the buttons for 40 seconds ,then release the button and Push the ON button.
Please try the steps and let me know the result.Waiting for good reply from u.