Sorry to hear about this. Was anything plugged into the PCMCIA when the Amiga hit the floor?
I have an Archos PCMCIA HD and had to stop using it when I got a Blizzard 1230 MKIV as with the Blizzard enabled it stoppe dthe AMiga recognising the HD (where is this going?) Oh yes, does the PCMCIA work after you have unplugged anything in the exapansion slot underneath?
Where did the whistling seem to be coming from? Whereabouts in the Amiga? E.g. at the vents, nearest the 'V' key etc etc.