One of the biggest landmines investors need to avoid is investment in "value traps," particularly in the technology space. Just a few of these can ruin a portfolio's performance. It is not that easy to steer clear of such stocks. The temptation to buy these former high flyers at enticing valuations is akin to being tempted, in a game of Texas Hold 'em, to play King Jack or A10 unsuited. It is easy to throw in a few bucks and play the hand, and you might even win a few times along the way. However, the play is almost certain to be a bad trade over time, and it will likely leave you with big losses, especially if you continue to feed to pot in order to try to rescue your poor starting hand. In the technology world, momentum seems to be everything, given the pace of change in the space. Companies like AOL ( AOL) or Yahoo! ( YHOO) can be riding high for years and then get crushed by one bad product cycle, a new competitor or a shift in consumer behavior. Once momentum is lost, it is extremely hard to recapture the magic. For every successful turnaround story like Apple ( AAPL) or IBM ( IBM) in the 1990s, there are a dozen others that turned out like Palm, Blockbuster, Wang Laboratories or Digital Equipment. When a company does successfully reform, one of the key ingredients is usually a visionary leader. Unfortunately there are very few Steve Jobs in the world. Even someone like Dan Hesse of Sprint ( S), who is doing a marvelous job so far in turning around that telecom name, is a rare find. So, all this being said, here are several "value traps" selling at rock-bottom valuations that should be avoided. Dell ( DELL) Pros: The stock is selling at less than 6x forward earnings, it has more than $3.5 billion in net cash on its balance sheet and is priced at less than 4x operating cash flow. Why to avoid the shares: It has little mobile penetration; the founder still in charge, so it's unlikely a strong new leader will be brought in; it has huge exposure to the commoditized personal-computer market with little margin; European sales are tanking; and so on.