IBM to Put Its PC Business Up for Sale  SAN FRANCISCO (Reuters) - IBM &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=IBM.N target=/stocks/quickinfo/fullquote"&gt;IBM.N&lt;/A&gt; is looking to sell  its personal computer business in a deal that could be worth up  to \$2 billion, The New York Times reported on Friday, capping a  gradual withdrawal from the business it pioneered.