Market research firm Gartner Inc. reduced its 2008 forecast for personal computer shipments and warned that the estimate could drop further if the economy takes another turn for the worst. The firm now sees growth of 10.9%, or 293 million shipments, versus its forecast late last year of an 11.6% increase. Moreover, the firm warned that those numbers could drop to the single digits. This is bad news for pure-play PC manufacturers along with their component providers.

Gartner sees a healthy PC market right now, but several challenges in the near future. A deepening U.S. recession, the rising possibility of a slowdown in China's economy following the Beijing Olympics and higher oil prices could all put a damper on PC shipments this year. However, the firm also noted that PC sales should be boosted late this year through 2010 thanks to a desktop replacement cycle. Garnter predicted that strength in the emerging markets - which accounted for 60% of global growth in the fourth quarter - would also play a critical role.

This is bad news for pure-play PC-makers like Dell Inc. (NDAQ: DELL) that have already been having a bad year. The PC manufacturer has seen its domestic sales drop off a cliff and has been reliant on strong international growth and cost-cutting to drive revenues and improve its profitability. A slower domestic situation will only require additional international growth while cost-cutting can only be a temporary solution to a long-term problem. The reality is that PC sales are declining while the real money-maker - laptops - are quickly falling in price.

Struggling chip-makers like Advanced Micro Devices (NDAQ: AMD) may also find themselves in trouble. The company relied heavily on new product shipments to break-even last quarter and any slowdown could quickly send them back into the red despite plans to return to profitability by the end of 2008. Luckily they still have a chance at it if the replacement cycle begins as strongly as expected at the end of the year, as they are one of only two major chip manufacturers for PCs and laptops.

The reduced forecast could also affect many other companies to a lesser extent. PC manufacturers like Hewlett-Packard (NYSE: HPQ), Apple Inc. (NDAQ: AAPL), and International Business Machines (NYSE: IBM) may also feel some heat, but their diversified product lines should bar any major losses sustained. In the end, the PC business was thought to be relatively recession-proof, but these new predictions could change the story.

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