IBook, Ram and the fan...

I recently purchased 512 MB of Ram for my ibook and, after I had installed it, on startup, the screen goes blank and the fan runs - that is until I turn it off by holding in the power button. I have had this problem before, but never so consistently. The problem has happened twice before, both times necessitating repair, but neither was brought on by a clear event. Occaisionally it will boot up and work for a few minutes, but then the screen will go blank and the fan will start up again. It now works without the memory in. Any suggestions or pointers? Much thanks.
iBook G4   Mac OS X (10.3.9)  

I answered this one myself - apple sold me the wrong memory. I exchanged a box of PC 2700 for PC 2100 but they gave me a mismarked package of 2700.

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