File System Check Error....HELP!!

[NeoAndersn007 at aol.com]

hello,
Im new here so if this has been asked before sorry but Ive tried everything 
else. I was trying to get my old harddrive, CD-Drive, and RAM stick in my 
computer running on Fedora Core 2. None of them worked and I had a terrible time 
getting my computer to even startup. After I got it to work it get me the 
following error which I can't figure out how to fix:

fsck.ext3: Disk write-protected; Use the -n option to do a read-only check of 
the device.
Read-only file system while trying to open /dev/hda2

*** An error occured during the file system check
*** Dropping you to a shell; the system will reboot
*** when you leave the shell
Give root password for maintenance
(or type Control-D to continue)
(Repair filesystem) 1 # 

I have tried reconnecting everything, taking out my RAM and putting it back 
in, disconnecting power cord for long periods of time, re-installing fedora, 
and editing the bootup commands. nothing seems to be working, help!!!
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