No, I will show you, here is the very same question you already asked 5 years ago: http://www.elitetrader.com/et/index.php?threads/wanted-trading-laptop.214003/ Not to mention: 1. Unless you gave specifics (size, weight, battery life,etc), we can't answer your question. 2. Laptops are dirt cheap nowadays, you should buy a new one. 3. This is an instrument your livelihood is depending on and you wanna save a few bucks???
The Dell M6800 is a good, cheap choice. Nice, wide screen. 4 USB ports that can then support 4 external LCD monitors. However, be sure to get one with an SSD and Quad Core processor. I made the mistake of getting a Dual Core CPU.