* Financial jitters drive global equity sell-off
* AIG shares tumble on capital adequacy fears
* Goldman shares sink after profit slumps 70 pct
* Fed to decide on rates, verdict eagerly awaited (Adds details, update prices)
By Ellis Mnyandu
NEW YORK, Sept 16 (Reuters) - U.S. stocks headed for a sharply lower open on Tuesday as investors fretted about insurer American International Group's <AIG.N> ability to secure desperately needed capital to avert more credit agency downgrades.
In addition, computer maker Dell Inc <DELL.O> said it was seeing further softening in global demand for technology, which further soured the tone after Wall Street's worst day on Monday since markets reopened after the Sept. 11, 2001 attacks.
Shares of AIG dropped more than 30 percent to $3.32, while Dell fell more than 8 percent to $16.50 before the opening bell.
Elsewhere in the financial sector, Goldman Sachs <GS.N> fell to 2 1/2-year lows, down more than 6 percent at $127.12 after the investment bank posted a 70 percent slide in third-quarter profit.
Worries about AIG were also accentuated by concerns that the U.S. government might again refuse to provide a financial lifeline to a major firm after it balked at a federal bailout for Lehman Brothers Holdings. The 158-year-old Wall Street icon subsequently filed for bankruptcy.
"A lot is riding on AIG. They got hung up in the real estate debacle," said Andre Bakhos, president of Princeton Financial Group in Princeton, New Jersey. "The longer we go without a tentative deal to inject capital into AIG, the worse things will get."
S&P 500 futures <SPc2> fell 26.40 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures <DJc2> dropped 159 points and Nasdaq 100 <NDc2> futures shed 25.50 points.
New York Gov. David Paterson told CNBC television that AIG has a day to fix its problems. For details, see [
]Federal Reserve policy-makers met on Tuesday to decide on interest rate policy and could leave rates steady. Investors will scrutinize the accompanying statement for clues about the prospects for corporate profits.
"Unless the Fed cuts this afternoon, I don't think it's going to be a good day," said Cleveland Rueckert, market analyst at Birinyi Associates Inc, in Stamford, Connecticut.
The decline in AIG, a Dow component, comes after the demise of investment bank Lehman, which filed for bankruptcy protection because of losses stemming from the U.S. housing slump.
Unease about financial services companies drove investors into the relative safety of government debt as global equity markets sold off. (Editing by Kenneth Barry)