Poweroff can't turn it on

Most likely it is going into a safe mode as one of the speaker connections might be creating a short in the audio amplifier. Check speaker terminals connections. The model number of the unit would be helpful to know.

Have you tried the owners manual (not the repair manual)? It will probably have something about this. It may be that this is the generic message that the unit gives you when you have a bad output channel which would put it into a protection mode.

Good day,
It sounds like you may be putting your laptop into "sleep" mode.

Depending on your operating system installed on your laptop.
Make sure that you Shutdown or Poweroff via your operating system to turn your laptop completely off.

Three things ...
check that your Printer has no error: no paperjam, paper in the paperholder ink is full, etc....
Then the next step is to verify you have the correct printer driver installed on your pc. I assume this is correct as you were able to print prior to the issues occuring I assume.
lastly ... poweroff the print, poweroff your pc, wait 10 seconds... turn on your printer. Turn on your pc.
also check when your pc has turned on that the print queue is not in offline mode.,
good luck ... hope this helps

the audio amplifier Ic are burned and need to be replaced

Im having this same problem. It happened after I had the music up really loud for about 3 hours. Also, where it has the volume all i see is -- instead of a number when i try to turn it on

Check for a bad ground on the input circuit board. you will need to re-solder them. Remove top cover and rear panel (many screws on rear panel) The input board can easily be accessed and resoldered. you should also check for a bad ground on the speaker jacks. If it is not repaired, sooner or later you will probably need an output IC. good luck.

I m having sigmatel s4 mobile. I made some changes in Engineer menu. I have actually turned on high speed dual sim mode. after that poweroff in 3 sec display message come and till now it has not started. tell me how to rectify it. Also i don't know how to rectify it.

It may be a PROTECT MODE. Check is your other equipment properly connected to receiver.

When you turn on receiver it will power off. Poweroff shows up and than turns off. if the front panal reads over load the output ic pac001a is defective i had repaired this model before