Dell has gone green. The Texas-based personal computer maker's OptiPlex GX280 features an environmentally friendly design that complies with international standards reducing hazardous chemical compounds in PC chassis. The GX280 desktop and mini-tower chassis also offer improved usability with Dell DirectDetect, a diagnostic tool that identifies system status. Four indicator lights on the front of the PC help tech support personnel quickly diagnose more than 24 hardware problems. Also included is a variable speed fan to cool the power supply with less power and noise. Prices for the desktop OptiPlex GX280 start at $7,036, while its mini-tower version sells from $7,161.