Don't have any trouble with my Apple, but admittedly it's not an iMac.
I have an Apple Performa 5400 (at home), a Dell Latitude laptop (work and home) and a fully working 1989/1990ish vintage Acorn Archimedes. Of these the Acorn is by far the most innovative and interesting computer and I still use it for DTP. It's a pity the power of M*******t put paid to any real success to manufacturers like Acorn who first introduced RISC chips and where software was beautifully and compactly written in machine code.
mcmoo