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			<title>Macintosh IIsi and LC: Third-Party SIMM Incompatibility</title><body class="ac-gn-current-support">
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<h1 id="main-title">Macintosh IIsi and LC: Third-Party SIMM Incompatibility</h1>
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<div id="intro-container"><div class="truncate"><div class="attr SYMPTOMS"><div class="attr TOPIC"><FONT SIZE=4><BR>
Some Macintosh IIsi and Macintosh LC customers have difficulties with<BR>
third-party 2MB SIMMs installed in their systems.  Reported problems<BR>
include system hanging and/or system crashes sometime after a third-party<BR>
2MB SIMMs upgrade.  Read the following discussion for more details.<BR>
<BR>
</FONT></div></div> <!--  attr Symptom  --></div> <!--  truncate --></div> <!--  intro-container --><div class="clear"> </div>
 </div>   <!-- abstract end -->
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  <div class="attr SUMMARY">
Apple investigated the problem and discovered that this occurs because<BR>
some third-party 2MB SIMMs are not compatible with the Macintosh IIsi and<BR>
the Macintosh LC.<BR>
<BR>
You can determine whether your third-party 2MB SIMMs are compatible with a<BR>
Macintosh IIsi or Macintosh LC by removing them from the system and<BR>
installing known good Apple 1MB SIMMs.  If the symptoms disappear, the<BR>
problem was in the third-party SIMMs, and you should discontinue using<BR>
them in your system.<BR>
<BR>
Contact the manufacturer of the third-party SIMMs if this troubleshooting<BR>
procedure determines they are incompatible.<BR>
<BR>
 <BR></div>
</div>


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<div class="mod-date">Published Date: Feb 18, 2012</div>
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