Train,Bistro:
As far as I know, you "shouldn't" have any problems with a higher wattage power supply. The problem is usually with the physical dimentions of the unit. The 70 watt power supply I worked with was only half as wide as a "normal" unit. And it fit quite snugly into the case. You also have to look at the back of the case and see if the power connector etc. will fit into existing holes. If you like I can check with Compaq on Monday. Btw, What model Compaq are we talking about?