Nothing happens when I turn it on. Checked all the usual powerswitch bushings etc

Sound like something is not torced right and could be anywhere best would be to get the vehicle suspended on a lifter and with a buddy run the trans mission and brake to wheel stop and see from underneath what is happening. Watch for any module shifting, ie engine, differential props etc.

Would look first at condition of bushings. Live in a dry area? Rubber bushings dry rot quickly in Colorado, New Mexico, etc. If you have already isolated it that well, though, then you probably already checked that, so apologies if this tells you nothing new, but there are not that many possibilities for creaking sounds from front suspension. Ball joints usually clunk or pop, and strut/spring mounts seem out of range based on your description.

I get a similar issue from my Bush sound bar. The sound drops out when the tv programme/movie etc has a period of silence in the audio track or just very low background music (no speech). As soon as someone begins to speak it starts up, but usually it misses the first couple of words. Bar is connected directly to a Samsung tv via the optical cable. Any ideas?

Make sure all the ends on your battery cables are clean and tight. I got a tow in because my car would not try to start even tried boosting to no avail. All my lights and radio was working but they said the cable was corroded and would not let the full power work. We replaced the battery cables and worked like new now.

just remove the power plug from the back of your comter and press the powerswitch few time then plugin the power cable and press the power switch

With the information given this is not a sure solution. Questions that need to be asked is when does this happen, turning at slow speedm high speed, when hitting a pot hole etc? Since you have replaced a lot of things already, assuming you have NEW good quality parts so you did not replace bad parts with new bad parts i would definitelu check the pitman arm. This runs from the stering gear to the tierod. It can give you some good clunks while steering, especially at low speed when there is a lot of resistance. Check it by having someone turning the steering wheel when watchin/feeling it.

if your C80 is mounted outside the boat maybe water came inside the C80 .
This typ has a lot of problems with their seal.
Water comes to the keypad and the powerswitch dont work anymore

This is pretty hard to diagnose without being there. I would suggest that you take a hose with ends cut off and listen through it, since you are mechanically inclined. I would also check things that may be rattling against the firewall, the exhaust system for rattles as they tend to do so when bushings are worn out, and recheck the things you have if you haven't done so with hose or stethescope. I had a similar problem that was a loose exhaust bushing... Hope this helps you, Rick

Reset printer, perform a NVRAM INIT
Turn off powerswitch- press and hold * and Menu/Enter on keypad of printer - While continue holding down buttons, turn on the powerswitch.. after a few moments it will begin to beep and say "perminante storage init" release the buttons and wait for the unit to re-initialize.
As always when perform a disc reset, you loose your settings.

I'm having the same problem. Moved from one room to another and no nothing happening except the fan.