Grey screen at start up on my ibook 4G

i need to repair my ibook G4 from freezing at start up i cant even get into safemode can you guide me through it ?
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More about grey screen start ibook
  1. Command + S (single user mode)
    enter in terminal the following
    /sbin/fsck -fy
    /sbin/mount -uw /

    Sometimes i run
    /sbin/fsck -fy
    again after the mount command depending
  2. Have you tried zapping your PRAM? Hold Command+Option+P+R while booting up and wait for 3 dings before you let go.
  3. Honestly, probably a shot logic board. This is at least an 8 year old computer; I'd think about investing in a new Macbook, or if you don't want to spend >$1k, get a cheap PC laptop.
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