I had system crashes before OSX, more or less frequent depending on the version of the system (some were not very stable), but I don't remember what they looked like. I don't think there was an equivalent to the blue screen of death but there were cases where the system froze or became unusable and had to be restarted by brute force, sometimes by unplugging the power cord.
In early versions of OSX there was a gray screen of death with a message in several languages. There's a name for it but I have forgotten it (kernel failure or something), and as I mentioned I haven't seen it in several years I think.
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