By Dan Gallagher and Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks slipped Thursday morning, brought down by slumping PC sales data that put major stocks like Microsoft Corp., Hewlett-Packard Co. and Intel Corp. well into the red.

The Nasdaq Composite Index (RIXF) fell fractionally to 3,296 while the Philadelphia Semiconductor Index (SOX) dropped nearly 0.2% in early trades. The Morgan Stanley High-Tech Index (MSH) fell by 0.5%.

Late Wednesday, IDC reported that PC sales slid nearly 14% in the first quarter compared to the same period last year. That was the largest quarterly decline measured by the market research firm since it began tracking the sector in 1994 and was well below the 7.7% drop the firm had predicted for the quarter.

Microsoft (MSFT) bore the brunt of the fallout, as the disappointing PC sales indicated weak demand for its Windows 8 operating system that just hit the market over the fall. The stock fell more than 4.6% to $28.86 in early trades.

The firm was downgraded by at least three brokerages -- Goldman Sachs, Normura and Hilliard Lyons -- all of whom cited the worsening PC data as a key reason for their moves.

"Our Sell thesis is based on our view that the company faces critical secular challenges given the deteriorating PC demand backdrop," wrote Goldman's Heather Bellini in a note to clients.

Intel (INTC) shares fell by 2.4% to $21.73, while Advanced Micro Devices (AMD) fell by 3.3% to $2.52. Microsoft, Intel and AMD all report results for the March quarter next week.

Hewlett-Packard (HPQ) took a hard hit, falling more than 5% to $21.10. The high-tech giant has been on a strong run lately, with its shares surging nearly 60% over the past six months -- making it one of the top-performing tech stocks for that period.

Dell Inc. (DELL) also took losses, falling 0.5% to $14.14 -- though the company current share price is somewhat protected by a pending buyout agreement that has drawn two other interested bidders.

Apple (AAPL) shares slipped by 0.4% to $434. Sales of the company's Mac computers slipped by 7.5% in the U.S. -- though its market share edged up to 10% in the first quarter, according to IDC>

Elsewhere in the tech sector, Netflix (NFLX) was one of the few gainers, up 3% in early trades after the company announced an expanded agreement with Hasbro Inc. (HAS) for kids programing.

Amazon.com (AMZN) picked up 1.1%, while Facebook (FB) rose by 1.2% and LinkedIn (LNKD) was up 2%.

Fortinet Inc. (FTNT) shares crashed more than 17% to $18, after the network security firm cut its outlook on lower-than-expected billings. The stock was downgraded to neutral by several brokers, including Morgan Stanley, Bank of America/Merrill Lynch, Wells Fargo and Needham & Co.

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