One of my relatives has given me an old Maciontosh Cetris 650. I took out the old CD C addy drive and put in an Apple CD-ROM, The hard drive is 230mb, it also has a floppy drive! Anyway aftrer I put the CD_ROM in the computer started up, BUT the mac has to monitor ports, I put the monitor plug into the wrong port so I thought the mac wasnt working, yetr the hard drive was spinning and everything. I turned off the power switch, then i noticed that there were two monitor ports! Now when I hook it up to the other port it works fine, BUT it has the Floppy Disk Question mark icon, now I have a System 7.6.1 CD (original cd), the mac accepts the cd and starts up from it when I hold down the "C" key at startup, now when it gets to the desktop I get a bomb messege, it says something about error 41. The system 7.6.1 CD is badly scrached so this problem might be CD related. Apple says the Cetris 650 can run up to Mac OS 8.5 (wow) So I pop in a copy of my Mac OS 8 CD, the computer doesn't read it. I went to Apple.com and downloaded the PPC Disk Tools Disk for System 8.1 (I think it was 8.1 or 8) When I put in the floppy a message comes up saying "This Disk Tools disk will not work on this computer. Use the disk labeled "Disk Tools 1" Then there is a button saying "Restart" Where do I find Disk Tools Disk 1, I have looked at Apple's Older Downloads, could I have missed it? I need your help! Thanks... 
