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Futures Turn Lower as Greece in Focus; GE Sags

US stock index futures turned lower Friday as investors kept a close watch on Greece as the debt-ridden nation remains in talks with private creditors over a haircut on some of its bonds and after GE's revenue missed forecast.

General Electric beat analyst expectations on profit butits revenue missed, sending its shares sharply lower in pre-market trading. GE is a minority shareholder in NBC Universal, the company that owns CNBC.

Among techs, Intel , IBM and Microsoft all beat street estimates in afternoon earnings reports Thursday, but Google missed, sending its shares down. (Check results here.)

Meanwhile, Google tumbled after the Internet giant's results failed to reach Wall Street estimates, which has beaten on revenue for eight consecutive quarters. Brokerages Baird and Barclays slashed their price target on the firm to $750 from $760 and to $700 from $730, respectively.

Schlumberger edged higher after the oilfield services company posted a 36 percent gain in earningsthanks to strong land and offshore operations.

In Europe, Greece is in talks with private creditors over the details of a haircut on some of its bonds, agreed to a while ago as part of an aid agreement with the EU and the IMF.

General Motors has reclaimed again the top spot as the world's biggest-selling carmaker, dethroning Toyota for the first time since 2007.

In other news in the technology sector, a German court ruled against Samsungin a patent battle against Apple , part of the legal war the two giants are waging.

Billionaire investor Warren Buffett raised his stake in UK retailer Tesco after the company, which is the third largest retailer in the world, warned on profits last week.

—Follow JeeYeon Park on Twitter: twitter.com/JeeYeonParkCNBC

On Tap Next Week:

MONDAY: EU finance ministers meet in Brussels; Earnings from Halliburton, CSX, Texas Instruments
TUESDAY: 2-yr note auction, FOMC meeting begins, Obama's State of the Union address; Earnings from DuPont, J&J, McDonald's Travelers, Verizon, Apple, Yahoo
WEDNESDAY: Weekly mortgage apps, FHFA house price index, pending home sales, oil inventories, FOMC meeting announcement, Bernanke press conference; Earnings from Boeing, ConocoPhillips, United Tech, Delta, Motorola Solutions, Amgen, Netflix, SanDisk, Symantec
THURSDAY: Durable goods orders, jobless claims, new home sales, leading indicators, 7-yr note auction; Earnings from AT&T, Caterpillar, 3M, Nokia, AutoNation, Bristol-Myers, Time Warner Cable, Motorola Mobility, Starbucks
FRIDAY: GDP, consumer sentiment; Earnings from Chevron, P&G, DRHorton

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