But the market quickly recovers, with the Dow ending up 152 points, after the Associated Press says its twitter account was hacked.
The video streaming company added 3 million new subscribers, sending shares soaring late Monday. Apple reports after the close.
MSN Money's Charley Blaine discusses what caused recent fluctuations in the precious metal.
Stocks suffer their worst weekly loss since late 2012, and the markets face a tough week ahead with Caterpillar, Apple, Amazon.com and Exxon reporting.
Big Blue has an outsized effect on the blue-chip index because of its price. If the stock were simply flat, the DJIA would be up 100 points.
But IBM shares fall after hours, after earnings miss estimates. Still, stocks may open higher Friday after a Thursday swoon. The major indexes are off more than 2% since peaking last week.
Shares tumble on reports of weakening iPhone and iPad demand. But buying kicks in as soon as $400 is breached.
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The Market Dispatches column has been discontinued. Here's where to find the latest stock and business news on MSN Money, and the latest from market writer Charley Blaine.
MONEY & POLITICS
Breaking up big banks is an untested solution to the too big to fail problem that attempts to isolate and dismantle large, troubled institutions while protecting the rest of the economy.
The IRS is struggling to combat identify thieves who file fraudulent tax returns in the names of older residents who don't need to file.