Aragon 4004 power light on but no sound

Check the internal speaker line fuses.

Yes, check the rail fuses. But since it appears that both channels are dead it might be a fuse (or problem - faulty power switch?) related to the power supply. More likely that than two (or perhaps four) rail fuses blowing simultaneously.

Thanks for replies.
After a night, the amp worked again. But as soon I turned it off and on, I had no sound.
i ll check the rail fuses as you adviced.
Thanks again.

The amp does have a relay that mutes the output at initial turn-on for 3-5 seconds. It might be if you are turning it off then right back on, the relay hasn't had time to reset. Try leaving it off for a few minutes, then turning it back on.

Also, like Partial stated, it could be a faulty power switch and/or relay itself that is causing the problem.

If you get it running again, do NOT power it off...

-RW-

I never cycle an amp off and on without waiting at least 1
minute. I seem to recall Aragon or perhaps another warning
not to do this.

Thank you all for your discussion. I have sent it to a service center. Hope it will be solved at reasonable cost.