fell 4.2% in preopen
trading Friday morning. After the company warned that fourth-quarter earnings would be just 30 to 33 cents per share, below the Street estimate of 45 cents Thursday, Apple's shares plunged 46% in after-hours trading.
The company blamed lower-than-expected sales of its new
Power Mac G4 Cube
, lower September sales in all regions and slower educational sales.
lowered its ratings of the entire PC sector, and tech stocks were broadly lower in the preopen.
was down 5.4% and