1. The Laserwriter Pro 630 is a much better printer than the 600, as it has ethernet. Works with contemporary Apple hardware. Find a logic board and do the swap, and you'll have a decent printer for a long while.

2. These are standard HP4/HP5 cartridges. There is no difference between the Apple-branded cartridges and the others.

3. The toner cartridge take a bit of extra physical persuasion (a good shove) to sit properly in my Laserwriter Pro 630.

4. If your ram has fallen out in transport, you will get error lights. Get the service manual and take it apart. Not a job that is especially easy without the service manual, but not hard with it.