Complex sentence: The cap is red on ThinkPads, but is also found in other colours on other machines, for example, grey, black or blue on some Dell models and blue on some HP/Compaq laptops.
Split into simpler sentences: The cap is red on ThinkPads, but is also found in other colours on other machines. For example, it may be grey, black, or blue on some Dell models or blue on some HP/Compaq laptops.