Anyone with experience with a older Macintosh Classic. Been thinking of buying one, if I can find a nice one, but would be interested to hear from others on common issues that they have after all this time... If the HD goes, is it possible to replace or boot just from floppy? Many of the older Macintosh's for sale have no KB, or mouse, just lost, or is that a sign of other issues? Have the displays held up over time, burn-in, or squealing ? Other comments?