By Dan Gallagher, MarketWatch

SAN FRANCISCO (MarketWatch) -- Strong gains by Dell Inc. led the tech sector higher on Monday morning as new bidders emerged for the PC maker, while BlackBerry shares slipped on growing worries about sales of its new Z10 smartphone.

The Nasdaq Composite Index (RIXF) rose by 0.6% to 3,263 while the Philadelphia Semiconductor Index (SOX) rose by 0.7% and the Morgan Stanley High-Tech Index (MSH) rose by 0.3%.

Dell (DELL) shares jumped more than 3% to $14.61 after the company's board of directors confirmed previous reports that Blackstone Group (BX) and investor activist Carl Icahn were leading two separate efforts to launch bids for the company to compete with a privatization deal offered by founder Michael Dell and Silver Lake.

Icahn's group is offering to buy $2 billion worth of the company's shares for $15 a share. Shareholders could elect to take shares of the new company or cash. The deal is being supported by major Dell shareholders Southeastern Asset Management and T.Rowe Price. Blackstone's deal is worth $14.25 per share.

BlackBerry (RIMM) shares fell more than 3% to $14.42 after Goldman analyst Simona Jankowski downgraded the stock to a neutral rating, citing a "disappointing" launch of the company's Z10 handset at AT&T (T) and Best Buy (BBY) on Friday "with limited marketing and tepid sell-through" for the U.S. debut of the device.

"We now assign a 20% probability of success for BB10, down from 30% previously, as the disappointing launch of the Z10 at AT&T reduces our confidence that sell-through of the BB10 will be successful in the important U.S. market," the analyst wrote, referring to the company's new BlackBerry 10 operating system.

Yahoo (YHOO) shares rose by 2% after the company acquired Summly, a mobile news reader app for an undisclosed sum.

Apple (AAPL) shares rose by 1.5% to $469.37. The company acquired WifiSLAM, a maker of indoor GPS technology, for about $20 million, according to a report in The Wall Street Journal over the weekend.

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