Stock futures dip after four days of gains

* Treasury Secretary Timothy Geithner, at a meeting with European finance ministers in Poland, said the United States and the European Union must work closely together to overcome the current economic challenges. He said Europe has the capacity to contain its sovereign debt crisis, and must avoid "loose talk" about the euro.

* Research In Motion Ltd reported a steep drop in quarterly profit on limp sales of its smartphones and tablets, and offered investors little hope of a turnaround soon. U.S.-listed shares of RIM fell 19.4 percent to $23.82.

* S&P 500 futures lost 5.3 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures were down 61 points, and Nasdaq 100 futures fell 8 points.

* Thomson Reuters/University of Michigan Surveys of Consumers will release preliminary September consumer sentiment index at 9:55 a.m. EDT. Economists expected a reading of 56.5, compared with 55.7 in the final August report.

* Private equity firm Silver Lake is considering a bid for Internet company Yahoo Inc weeks after its chief executive was fired, according to reports.

* European shares rose early Friday, adding to gains following central bank action Thursday to boost liquidity.

* Stocks advanced for a fourth day on Thursday after coordinated central bank action to add liquidity calmed fears that Europe's financial sector was headed for a credit freeze due to the region's sovereign debt crisis.

(Reporting by Angela Moon; editing by Jeffrey Benkoe)