Updated from 4:15 p.m. EDT

A lack of catalysts to spark buying interest and persisting concerns about the health of the economy sent stocks lower again Friday.

The

Dow Jones Industrial Average

closed down 25.13 points, or 0.22%, to 11,508.10, and the

S&P 500

was off 3.25 points, or 0.25%, at 1314.78. The

Nasdaq Composite

slid 18.82 points, or 0.84%, to 2218.93.

The Nasdaq faced pressure from

Sun Microsystems

(SUNW) - Get Report

and

SanDisk

(SNDK)

, which both fell 3.7% or more.

Declines of at least 2.1% in

Caterpillar

(CAT) - Get Report

and

Disney

(DIS) - Get Report

dragged the Dow lower.

"Perhaps the buyers are exhausted," says Ken Tower, chief market strategist with CyberTrader. "We're right at the old high on the Dow and S&P 500. The old highs became old highs because those levels were the exact location where supply and demand tipped from favoring the buyers to favoring the sellers."

The major indices finished the week with losses. The Dow gave back 53 points, or 0.45%, the S&P 500 fell 5 points, or 0.37%, and the Nasdaq lost 17 points, or 0.74%. With only one week left in the month, the Dow is still higher by 127 points, or 1.12%, for September. The S&P 500 has gained 11 points, or 0.84%, while the Nasdaq has tacked on 35 points, or 1.61%.

The benchmark 10-year Treasury note was up 9/32 in price to yield 4.60%. A rumor that former

Federal Reserve

Chairman Alan Greenspan spoke about a housing slowdown and rate cuts at a speech Thursday night in New York initially moved the yield, but

The Wall Street Journal

confirmed that Greenspan made no comments about likely Fed actions.

John Canavan, a market analyst with Stone & McCarthy Research Associates, said that "people are getting forced into the bond market, especially with month-end and quarter-end coming up fast. There's been a rally in Treasuries since June, but with the quarter ending, anyone positioned wrong has felt the need to jump in now."

About 2.24 billion shares changed hands on the

New York Stock Exchange

. Decliners beat advancers by a 2-to-1 margin. Volume on the Nasdaq was 1.67 billion shares, with losers beating winners 2 to 1.

The main story of the day came after the bell, when

Hewlett-Packard

(HPQ) - Get Report

Chief Executive Mark Hurd held a press conference to announce the immediate resignation of Chairman Patricia Dunn and a further internal probe of a secret program that was aimed at plugging boardroom leaks.

Published reports suggested Hurd might have had more of a role than previously thought in a plan to access the phone records of directors and journalists. The stock fell 5.2% Thursday, but gained 0.7% to close at $35.11 Friday.

As for other newsmakers,

Boston Scientific

(BSX) - Get Report

shares sold off after the medical-device maker gave a disappointing forecast stemming from

weak stent sales. The stock tumbled 9.2% to $14.85.

Electronics giant

Sony

(SNE) - Get Report

said it will cut the price of its PlayStation 3 game console in Japan by 20% in an effort to compete better with

Microsoft's

(MSFT) - Get Report

Xbox 360 and the upcoming Wii from

Nintendo

. Sony gave back 60 cents, or 1.5%, to $40.86.

Meanwhile,

General Motors'

(GM) - Get Report

talks regarding an alliance with Renault and Nissan haven't yet been tremendously successful, according to published reports. GM was lower by 31 cents, or 1%, to close at $30.62.

Shares of

Palm

(PALM)

climbed 4.1% a day after the company posted fiscal first-quarter earnings. Palm said earnings slipped to $16.5 million, or 16 cents a share, from $18.2 million, or 18 cents a share, a year ago. Palm added 59 cents to $15.09.

Nike

(NKE) - Get Report

reported a first-quarter profit of $377.2 million, or $1.47 a share, down from $432.3 million, or $1.61 a share. Results included a $40.8 million of expenses related to the expensing of stock options. That cut profits by 16 cents. Analysts expected earnings of $1.41 a share. Nike was higher by $3.90, or 4.7%, to $86.36.

Crude futures, which briefly traded below $60 this week, eased $1.04 to finish at $60.55 a barrel, the lowest close in 10 months. Other energy prices were higher. As for precious metals, gold rose $7.10 to $595.40 an ounce, and silver was up 6 cents to finish at $11.31 an ounce.

Overseas, Europe's equities sank. London's FTSE 100 lost 1.3% to 5822, and Frankfurt's Xetra DAX gave back 1.3% to 5883. Asia's shares were also lower, with Tokyo's Nikkei dropping 1.3% to 15,635. Hong Kong's Hang Seng closed down 0.1% to 17,600.