Mac SE won't boot

I'm sorry; I should have been more specific. Mine is a SE which was equipped with a 20 MB hard drive from the factory. The interesting thing is it booted to the hard drive twice but the mouse cursor wouldn't move at all. All the other times I got the "quizzical floppy" icon. Also I expected to hear the traditional Mac bong at startup but this startup sound was quite different. Talk about a blast from the past! I actually got very lucky in getting a Apple Adjustable keyboard with the Mac SE and it came with a Apple PlainTalk microphone which the Mac SE can't even use. On the other hand I feel destined to have gotten the mic because my Mac Performa 200 was supposed to have one included with it according to the original box it came in (I got very lucky there somehow)but it didn't. So now I have a sense of my Mac Performa 200 feeling more complete than when I originally got it (actually I got it where I work whom got it from a local school). I have just now tried to boot to the System 6.0.8 Disk Two of Four and Disk First Aid can't see the hard drive. HD SC Setup can see the drive but reports the following error: Drive selection failed. Unable to read required information from the disk. That doesn't sound good ):. The hard drive also failed to mount on the desktop successfully too. What exactly does all of this mean?

Update; I think this means I have a dead hard drive. Thankfully I was able to find locally a 350 MB SCSI hard drive to replace it with. Thanks for the help of all involved. Though I'd still like to know where to get the FDHD upgrade kit. All suggestions are welcome (except for not upgrading since that's less fun). Any ideas people?

Apparently I accidentally bought an IDE hard drive when I wanted a SCSI drive. I found some 1.4 MB floppy drives and have a question. Will my Mac SE be able to use the 1.4 MB floppy drive without first upgrading my ROM? If that's necessary I also will need to find the ROM chip/s

I have since posting that message gotten the IDE hard drive exchanged for a 250 MB SÇSI hard drive. I get the following error message when attempting to format it with Apple's HD SC Setup using System 6.0.8 Disk Two of Four: Sorry, a system error has occurred. Address error. There is also a button that gives me the option of restarting. The hard drive already had Mac OS 7.5.5 installed on it which although supported is too new for my old Mac SE. What should be my next course of action? I've already tried zapping the PRAM which hasn't helped and the Mac automatically rebuilt its desktop file recently (though that wasn't needed since I'm going to wipe the HD).

According to Apple's Support's specifications pages for the Mac SE and Mac SE FDHD they both support up to Mac OS 7.5.5. Here's a link to the Mac SE FDHD's spec page: http://docs.info.apple.com/article.html?artnum=112172.

Update: I now know the reason for getting the error message; apparently I have a lot of bad 720k floppies. So far eight have proven to be bad. It turns out that disks one through three of four for System 6.0.8 I created using Disk Copy had bad sectors. The install option I used (software install of only what a Mac SE would need)didn't need disk four so I still need a good program to test it for bad sectors with. Worst of all is the fact that when I tried to run Disk First Aid it couldn't find the bad sectors. Is Disk First Aid only designed to find and fix file system errors? If that is the case Apple should either update it or do a total rewrite of it for safety's sake when using 720k disk formatted as 800k on older Macs. Disk Copy was no better and only managed to catch two to three of the of the eight bad 720k floppies I tried the Make Floppy command/menu item with. It makes me think some floppies can be formatted as 720k PC FAT12 format but not as Mac 800k. Very frusterating and I wish I would've known I had that many bad 720k floppies sooner (like before trying to use some of them to format a HD). I would like to know how I can find out if any of these floppies can still be formatted in a lower density format like PC FAT12. I also found out that the last owner of the Mac SE had incorrectly set the motherboard's memory jumper to the 2/4 position rather than removing it correctly (it didn't help that I didn't know the capacities of the modules in slots three and four either). It turns out it came with 2.5 MB of RAM.

My dad also checked the battery with a volt meter and it read 1.6 volts for a 3 volt battery. Should I replace it or not?