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Disk/file system trouble



May I ask your help in the following problem?

First my linux began to boot very slowly. After some time boot failed,
there was a message `error reading block ...' and I was dropped to
a shell. I tried fsck.ext2 but next boot completely failed.

Next I booted with rescue disk, ran e2fsck which cleared some entries 
or connected to lost+found. After all this treatment e2fsck returns
that the filesystem is clean, badblocks finds nothing. However...

Two things happen now:
1. During regular boot I get:  /devcua1  no such file found
2. The screen remains dark, from time to time there is a flash of light
as a failed attempt to write. When I press Ctrl-Alt-Del, the screen
reappears and I see the process of shutdown.
I may still boot with rescue disk.

Question: 
-What can I attempt in this situation? 
-How can I check whether the disk is physically damaged or is 
 it the file system? 
-Can I reinstall only the lost files? 
-Or nothing to do but reinstall the whole system and wait to the next disk
 crash?
Thanks,
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 Uri Elias					             	       
 Department of Mathematics,   Technion,  Haifa 32000,  ISRAEL	       
 Office:  04-8294183,   Fax: 04-8324654,   Home: 04-8221898               
 email:  elias@techunix.technion.ac.il  
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