As Colin suggested.
Additionally, regarding the blue screen itself,...
That is usually a feature of the TV rather than the VCR. If there is no or low input signal (ie. dirty heads), the TV displays a Blue screen instead of presenting just snow/noise.
If you turn the blue screen feature off (usually found somewhere within the TV's menu), then you will get a better view of the quality of the videos output.
Cobweb
March 2007