Hi guys, Our projector has a noticeable loss of projection power when i switch it to PC source. The PC source's overall picture is like 70% weaker. I can tell when i compare it to the menu overlay and with the video source. I also tried diferent PCs & notebooks, no improvement. We've also tried different resolution settings and others. we thought it was the bulb but again, the video input, menu overlay, & opening logo is normally bright. it is really the PC source that's bad. We've only used around 1/3 of the bulbs normal life span. Anyone have any ideas? could it be the cable? ....the PC input circuit? the projector is MITSUBISHI XD50U DLP projector. hope to hear from you. Thanks.