US STOCKS-Wall St inches down on Greece, China worries
* Greek default concerns remain
* GoPro shares surge on Google collaboration
* Indexes down: Dow 0.2 pct, S&P 0.1 pct, Nasdaq 0.2 pct (Updates to close)
By Caroline Valetkevitch
May 28 (Reuters) - U.S. stocks eased on Thursday as mixed messages about Greece's debt talks kept investor uncertainty high along with a sharp drop in Chinese shares after brokers tightened margin rules.
Seven of the 10 major S&P 500 sectors were lower, with the industrials sector falling the most, 0.4 percent, a day after the Nasdaq closed at a record high.
International Monetary Fund Managing Director Christine Lagarde said there was still a lot of work to do before Greece and its international lenders could clinch a cash-for-reforms deal.
Greece's government said it aims to reach an agreement with lenders by Sunday. A euro zone official said Greece will not be able to get the money still available under its current bailout plan if it does not agree to the outline of a such a deal by the end of the week.
"Everybody is coming out with a different story. I'm looking for an EU-endorsed comment rather than something coming from Greece to be sort of the final arbiter on what the sentiment really is with regard to a resolution," said Mark Luschini, chief investment strategist at Janney Montgomery Scott in Philadelphia, which manages about $67 billion in assets. Continuación...