Shares of some top computer companies are up at noon:
Apple Inc rose $17.64 or 7.5 percent, to $253.50.
Dell Inc rose $.45 or 3.0 percent, to $15.46.
Hewlett Packard rose $2.81 or 6.0 percent, to $49.54.
IBM rose $4.25 or 3.5 percent, to $126.35.
Lexmark rose $2.03 or 5.8 percent, to $37.12.
