Shares of Open Solutions ( OPEN) were among technology's losers Monday, sliding 11% after the software company issued disappointing first-quarter and full-year earnings guidance.

The company sees first-quarter earnings, excluding stock-based compensation costs, of 5 cents to 7 cents a share. The company predicts sales of $62 million to $64 million. Analysts polled by Thomson First Call project earnings of 21 cents a share and sales of $62.2 million.

For the full year, Open Solutions forecast earnings of 88 cents to 93 cents a share, excluding stock-based compensation costs. The company predicts sales of $370 million to $380 million. Analysts project earnings of $1.07 a share, with sales of $300.3 million. Shares were trading down $3.29 to $26.08.

Lexar Media ( LEXR) fell 4% after the maker of flash-memory products cuts its earnings guidance for the second time in three weeks. The company now anticipates a fiscal fourth-quarter loss of $20 million to $23 million, or 25 cents to 28 cents a share, on sales of $237 million to $240 million. Analysts project a loss of 15 cents a share and sales of $236.5 million.

On Feb. 13, Lexar projected a loss of $17 million to $21 million, or 21 cents to 26 cents a share, on sales of $240 million to $245 million. At the time, analysts were projecting a profit of 4 cents a share on sales of $225.6 million. The company, which did not offer an explanation for its most recent earnings revision, said it has postponed its earnings release until March 14. The delay will allow the company to complete its accounting analysis of inventory and other reserves, it said. Shares were trading down 31 cents to $6.89.

Shares of Nvidia ( NVDA) rose modestly after the graphics-chip maker announced a 2-for-1 stock split and increased the amount of stock it can buy under its repurchase program. The stock split will be effective on or about April 6 to shareholders of record March 17. As for the share buyback plan, the company is now authorized to buy up to $700 million in stock, up from $300 million. The company has purchased some $263 million in stock under the repurchase program. Nvidia shares recently changed hands at $49.32, up 16 cents.

Comtech Group ( COGO) rose 4% after the Chinese telecom equipment maker signed a $1 million services contract with Huawei. Under the deal, Comtech will provide engineering, technical consulting and other business services to Huawei's customer base in the Hunan province of China. "This is the first of several contracts we expect to sign as we begin to grow our business services revenue within our installed customer base," Comtech said. Shares were trading up 34 cents to $9.84.

Shares of BellSouth ( BLS) surged 12% after the telecom company agreed to be acquired by AT&T ( T) for about $67 billion. The deal values BellSouth at $37.09 a share, representing a premium of 18% over Friday's closing price of $31.46. AT&T said the company plans to cut about 10,000 jobs over the next three years as part of the deal. The deal is expected to be accretive to AT&T on an adjusted basis during 2008. Adjusted earnings, meanwhile, are expected to grow by double digits in each of the next three years. The merger, which is likely to receive extensive regulatory scrutiny, is expected to close within the next 12 months. Shares of BellSouth were trading up $3.73 to $35.19, while shares of AT&T fell 30 cents, or 1%, to $27.69.

Other technology movers included JDSU ( JDSU), down 3 cents to $3.68; Cisco Systems ( CSCO), up 39 cents to $21.43; Lucent Technologies ( LU), up 4 cents to $2.90; Intel ( INTC), up 16 cents to $20.48; Finisar ( FNSR), up 52 cents to $4.60; Oracle ( ORCL), up 11 cents to $12.90; Research In Motion ( RIMM), up $9.76 to $81.68; Sun Microsystems ( SUNW), up 12 cents to $4.55; Microsoft ( MSFT), up 11 cents to $27.04; Sirius Satellite Radio ( SIRI), up 1 cent to $5.02; Apple Computer ( AAPL), down $1.17 to $66.55; and Ciena ( CIEN), up 25 cents to $4.80.