You can lose colours from a picture when the SCART plug is not fully-fitted. As to whether you would lose the picture data as well, I wouldn't know. I've seen coloured blank screens appear due to a faulty set-top box, but usually you would need to power-cycle the box, and not the TiVo to correct this. It could be due to borderline signal-levels from a set-top box, which causes the TiVo to sometimes 'switch-off' the input.
Windows 7 MCE, 2 x Freeview Tuners, 1 x HD Freesat Tuner, 1TB Hard Drive, 1.5TB Mirrored Raid on e-SATA.
1 x Xbox360 MCE Extender.
1 x LinkSys DMA2100 Extender.
1 x Broken TiVo.