I think its a floppy drive problem. Eventually you will need to open the case, take out the drive to clean and lube it.

Does it have 2 drives or 1 and a hard drive that is not working either?

Macdrone said:

try a later system software.

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Anything later than System 6.08 is System 7. To run System 7 on a 68K Mac one needs 4Megs of RAM which we do not know it has or not. The Mac SE will run anything from System 6.04 to System 7.1

bigmessowires said:

My first guess is it's your floppy drive that's at fault, not the disk or the software.

This place will sell you a floppy with system software on it, if you suspect it is the disk that's the problem: http://rescuemyclassicmac.com

If you created a high density disk, and a Happy Mac appears when you insert the disk, that means the computer at least read the first few sectors of the disk successfully. So it means you have a high density drive.

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I agree, BMoW.

I use too sell bootable floppies from my Vintage Mac Site for the Big Apple Users Group. But I ran out of 800K Disks, and no longer can do this (or at least until I get more 800K Disks). I used to charge $3 per disk and $2.50 shipping and handling.