The power cord was a huge upgrade. I couldn't imagine the $150 power supply doing as much as the cord I told you about on ebay. $12 plus shipping and it was VERY substantual. Try the power chord before anything else. Hers a link to them.
http://cgi.ebay.com/POLARIZED-2-PRONG-POWER-CORD-AR-AP803-IEC-C7-GOLD-PLUGS_W0QQitemZ250577436015QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57943d6f
http://cgi.ebay.com/POLARIZED-2-PRONG-POWER-CORD-AR-AP803-IEC-C7-GOLD-PLUGS_W0QQitemZ250577436015QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57943d6f