Harmon/Kardon AVR55 Amber light is on on the front, but the unit will not fire up. As in the front light doesn't go green when I press the power button. It was working fine until I hit the circuit breaker button on the front by accident (didn't realise it was a tually there...)

Hi, Try this. Hope this helps and I have the link here to the manual.
Processor Reset
If the AVr behaves erratically after a power surge, first turn off the front-panel
main
power switch and unplug the Ac power cord for at least 3 minutes. plug the cord back
in and turn the AVr on. If this procedure doesn't help, reset the AVr's processor as
described below.
note: resetting the processor will erase all user configurations, including speaker and
level settings, and tuner presets. After a reset, reenter all of these settings from your
notes in the Appendix worksheets.

To reset the AVR's processor:
1. press the front-panel Standby/on switch to place the unit in the Standby mode (the
Standby Indicator led will turn amber).
2. press and hold the front-panel Standby and memory/folder buttons until the reSet
message appears on the front-panel message display.
3. press the memory/folder button again to reset the AVr's processor.
If the AVr does not function correctly after a processor reset, contact an authorized
harman
kardon service center for assistance.
to locate an authorized service center,
visit our web site at www.harmankardon.com.

https://www.harmanaudio.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dw409ee4c9/pdfs/AVR700NEW_OM_EN.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/laura_08254539050d64db

Unplug it from the wall for a minute or two, then plug it back in and try to power it up.

This is due to a audio output problem in the amp, first check the speaker wires for shorts, if okay! the audio output semiconductors must be replaced to remedy the situation.

Check all speaker wiring for shorts, if okay! there is a problem in the audio output stage of the unit or the protection circuit is not working properly. I would suggest a pro to evaluate.

They're not cheap...

http://cgi.ebay.com/Harman-Kardon-AVR-85-AVR85-AVR55-55-Receiver-Amp-Remote-/330393982652?pt=LH_DefaultDomain_0&hash=item4ced0416bc

http://cgi.ebay.com/Harman-Kardon-AVR-55-AVR55-Receiver-Amp-Remote-Control-/330421239700?pt=LH_DefaultDomain_0&hash=item4ceea3ff94

http://cgi.ebay.com/Harman-Kardon-AVR-85-AVR85-AVR55-55-Receiver-Remote-LN-/330483470685?pt=LH_DefaultDomain_0&hash=item4cf259915d

Check the speakers, make sure no starnds of wire are touching ony of the other terminals. Disconnect one speaker at a time and turn on the unit to see when and if the unit stops going in to protect mode. When it and if it doest start to stay on then you have removed the bad spkr. Unhook all of then and hook up the bad one only to verify that is whats causing ur problem...

no power with m Harmon kardon 695-01 sound system , the green light doesnot come on

There is a remote for sale at the following link:

http://cgi.ebay.com/Harman-Kardon-AVR55-5-1-Receiver-Remote-Guaranteed_W0QQitemZ350180068731QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item51885bcd7b&_trksid=p3286.m20.l1116

There are a couple others, but they are much more expensive:

https://secure.remotes.com/store/harman_kardon/avr55.html

http://www.replacementremotes.com/store/productdetailp.cfm?productid=1043

If I have helped you, please rate me as so. I helps me help others. Thank You.

If you go to the Harmon/Kardon website, you can find where to buy replacement parts.

http://www.harmankardon.com/

Select product support on the front page, then go to parts.

Then select your product as Harmaron/Kardon SoundsticksII and select your country.

Hope this helps,

Nathan.