SO I had a chance to test out the Macs in the shed on Saturday...

I removed all the clock batteries, visual check inside for spiders/rust/damage and then tested and labeled each but from memory:

Only one of the Mac Plus powers on, and the SE powers on but no chime/display...

Most of the Centris/Quadra/IIvi/IIvx/7100's power on or boot. From memory only one didn't power on and a couple of them booted to an OS. Amazing.

In the pile of 6100's and 6200/6300's there were two dead PSU's, one missing PSU but the 6360 booted up to an OS and even played a "Performa Intro" video which was AWESOME. Also one of the 6200 booted up with LOADS of HDD testing/recovery software. Interesting.

The 6400 booted to OS 7.5.5 but the 6500 started up to a "?" which I suppose is at least promising.

5300 DE booted up to OS 8 but the 5500 (beige) wouldn't work until I unplugged the HDD which was clunking quite loudly.

G3 desktop and G3 minitower server both worked, cool.

The only one I didn't test was the WGS 9150/120 but only because I forgot about it :S

Re-descovered a Blueberry 400, Strawberry 400 and Graphite 700 iMac in the shed I forgot I had. Only the Strawberry worked though xx(

Here's two pics... Better than nothing I suppose...