http://www.trademe.co.nz/a.aspx?id=672197516
If you're interested, you'd need to confirm details with seller but it appears it's the later 'enhanced' model - 20Mb option/640Kb on board/half height devices.
Just wanted to mention that because it's potentially closer to original than it appears.
"Wont go when motherboard is connected"
yey tantalum capacitors (easy to find fault, they're usually 1 of about 5)