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1 or 2 screws and you can pop the top on the mouse and clean the rollers from inside.

I run 7.0.1 as I used it for AOL back in the day as a spare until I got a powermac.  Modified a geoport external modem to get power from the keyboard and away I went.  You have not lived until you were on AOL in black and white.

System 7.5 had a requirement of 4 megs of ram, so to run on a plus with an HD20 in 1994, some 6 years after the Plus was released there was no other way to put it on there.  System 7 could use much less ram on boot.  The LC in 1994 that came with 7.5 had 4 meg on board so it was a non issue.  I...

I have system 7 on my plus now with 4 megs of ram.

HD20 runs system 7.0.1 just fine.  System 7.5.5 may run but my guess is it would be pretty slow.

hard disk failure usually also, try booting from the rom, as its the only mac that can natively.

how about caps?  there are capacitors on the screen boards on the sides that leak, and the inverter board.  At this age it would be a great idea to clean off the goo and replace.

apple cd rom extention 4 or older for 7.1 or older for apple drives, shoud be.

mac identifier 1.1.1 is what its called.

no look on mac garden there is a utility extention that fixes it to show correctly like in 7.

575  will work but video mod or system will need to be modified to work in a cc.

i have not seen any leakage on the newer perfomas like on the LC's.  I have just seen straight up failure issues, like not turning on and such, more like those caps dry up, not leak.

scsi voodoo

lol That would do it

But holding the C key at boot should allow the cd boot, if not might be caps.

remove the battery, dont need it.  Press the switch on the motherboard, take a look, its probably a good time to start thinking about capacitors.  i have done one with all the rest I have booting fine.  Hard drive could be dying but internal cd should let it boot.  I would lean towards a...

they cannot take it.  They do support scsi still externally but not internally.  I am not sure if you could just put an ide drive in place of the scsi drive and change the board as I have not tried but i dont think the cables are the same.

the 40 mhz upgrade for the 638 is pretty simple, like moving 3 resistors and all set.  noticable speed bump from 33.

without the edge connector no.  I believe that is incorrect.  The 550 uses the same motherboard as the color classic II.  

The 638CD can be overclocked to 40mhz and is 040.  If he needs a powermac or G3 its better just to get a tower rather than a 7100 or 7200.