Screechy noise and very low sound in my Amiga 4000

And of course I know I know .......'it's the caps..replace THE CAPS!' ..how many times have we heard/ read that in the Amiga forums over the past 10 or more years since our original Amiga hardware is reaching the age where the original capacitors are failing and that unsightly acid spews all over our precious motherboards damaging traces and other components....BUT this time it might not be the caps or maybe it is....let me explain. 

I replaced all the caps on my MB and original power supply 2 years ago and all was fine until one day last year I decided to try one of the ATX PSU's out on my A4000...don't ask me why because I had replaced the original noisy fan in the PSU and it was running as silent as ever but such is the way my head goes many times in my man cave!? I purchased the ATX adapter tried the 1st ATX PSU and nothing happened so tried another older PSU and pfft bang boom a loud noise and the magic smoke came out of the PSU!%^#@?! Turned off the power to my A4000 and my adrenaline was through the roof with worry about destroying a perfectly great system for the sake of trying out this darn ATX adapter !!! Then the real hysteria came in .....what if my beloved Cyberstorm MKIII was fried too !#@#!@#$%! oh Lord I had a migraine just thinking about it so started immediately taking out my CS-MKIII to inspect it for any obvious damage and it passed the visual, touch, and more importantly smell testing so next step was to plug my original PSU in and try to boot her up without my CS-MKIII and voila thank God and all that is good that she booted up just fine !!!! ALELULIA !!! Plug my CS-MKIII back in again and all good except I got to look at some of my fav demos to celebrate and when I turn on my amp all I hear is a loud high pitched screeching noise and when the demo starts I could barely hear it in the background of the screeching. Unplug the amp, check the cables, have a quick look inside the case and all ok so this is where I'm at and here's a few pics before I take her all apart and have a good luck at the MB

 

 

 

 ..more to follow on this issue hopefully sometime soon but ya never know what goes on inside & more importantly outside the mancave but more importantly I hope everyone is managing ok with this Covid-19 virus pandemic still going on and supposedly stronger this fall then it first was discovered last February so please stay safe !