Will I lose quality when using a video adapter cable?
For analog video adapters you almost always will lose some quality / signal strength, but it may or may not be all that noticeable. For example, the analog component of a DVI-A or DVI-I connector is nearly identical to VGA, which makes adapting a DVI-A or DVI-I port to VGA very simple (and common). For digital connectors it largely depends on what you are trying to do or achive. For example, converting an HDMI signal to a DVI-D signal loses almost nothing in the way of video signal, but you do lose the sound transfer capabilities of HDMI (DVI connectors do not pass through audio). For something like HDMI to VGA - digital to analog - you may experience a significantly higher rate of signal loss as you're now actively modifying the signal and the mediums simply are not compatible with one another.