2005 but it doesn't count because they didn't beat an SEC team for the championship.
USC never beat a team 42-38 in 1990 http://www.fanbase.com/USC-Trojans-Football-1990 The closest score to this question was USC beat UCLA 45-42 if that helps
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USC under Pete Carroll is undefeated against the SEC. The scores of their recent games are listed below. It's also worth noting that their last game (a 50-14 win over Arkansas in Fayetteville) was against the team that went on to win their division in the SEC that year. 2002: #22 Auburn @ USC: USC 24, Auburn 17 2003: USC @ #5 Auburn: USC 23, Auburn 0 2005: Arkansas @ USC: USC 70, Arkansas 17 2006: USC @ Arkansas: USC 50, Arkansas 14
USC is 22-11-1 all-time versus the SEC.
Penn State in 1996
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Alabama Beat USC Alabama Beat USC 24 / 3 Alabama 24 USC 3
According to College Football Data Warehouse, after the 2007 season USC's all time record against the SEC is 17-10-1.
That was Alabama, 37-29, on November 29 in Honolulu.
i hope so wait a sec you should try your self!