By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- The benchmark S&P 500 closed at a fresh record Thursday, as investors welcomed dovish remarks from Federal Reserve Chairwoman Janet Yellen before the Senate Banking Committee.

Yellen's comments, in which she reaffirmed the central bank's accommodative policy, pushed the index above the key technical level of 1,850 to the new high, after three straight unsuccessful attempts this week.

The S&P 500 (SPX) finished the day 9.13 points, or 0.5% higher at 1,854.29 and turned positive for the year.

The Dow Jones Industrial Average (DJI) ended the session 74.30 points, or 0.5%, higher at 16,272.71.

The Nasdaq Composite (RIXF) closed at the best level since April 2000, adding 26.87 points, or 0.6%, to 4,318.93.

Read the recap of our stock market live blog.

"There is no difference between Yellen Fed and Bernanke Fed and markets like that. She also reassured markets that the Fed is not on autopilot and adjustments will be made if warranted," said Kim Caughey Forrest, a portfolio manager and senior equity analyst at Fort Pitt Capital Group.

Yellen told senators it was difficult to tell how much of the recent decline in U.S. economic growth was due to weather, adding the central bank might consider a pause in its reduction of bond buying if the weakness persists.

In economic news, the number of people applying for unemployment benefits rose last week to match the highest level of 2014, suggesting that progress in a gradually recovering U.S. labor market has slackened off. However, the average of new claims over the past month, usually a more reliable gauge than the up-and-down weekly number, was unchanged at 338,250.

A slowdown in orders over the past few months by American manufacturers was reflected in the durable-goods orders reading for January, however the drop was less than forecast. Orders for U.S. durable goods fell 1.0% in January as demand tapered off for most big-ticket items except military hardware, the government said Thursday. Economists surveyed by MarketWatch had expected orders to fall 2.5%.

Investors kept a close eye on the much-hyped technical level of 1,850 on the S&P 500.

"This market seems to be driven by technical levels, rather than data. If we push through the 1,850, then we will go higher. But if we stay below that market for the next few days, then markets will head south and we will test 1,750," said Uri Landesman, president of Platinum Partners.

In corporate news, J.C. Penney Co. (JCP) jumped 25% to $7.47, after making gains late Wednesday on better-than-expected results.

Mylan Inc. (MYL) shares gained 9.4%, after the pharmaceutical company on Thursday reported fourth-quarter profit above analysts forecasts.

First Solar Inc. (FSLR) shares climbed 8.4%, recovering some of the solar panel maker's sharp losses on Wednesday after its fourth-quarter earnings fell short of expectations.

Sears Holdings Corp. (SHLD) rose 6.5% after the retailer said its losses narrowed compared with the same period a year ago.

Best Buy Co Inc. (BBY) shares rose as much as 7% after the retailer said it swung to a fourth-quarter profit, beating forecasts, however, gains fizzled out and shares closed 1% lower.

Pacific Ethanol Inc. (PEIXD) rallied 65% to $14.94 after the low-carbon renewable-fuel company reported that it swung to a profit in the fourth quarter.

Overseas, Asian markets were mixed and European stocks fell. Gold prices rose as political turmoil in Ukraine prompted haven buying and the dollar rose against the Russian ruble but weakened against euro.

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