So today I tried out snow leopard (I installed it on an external usb HDD) and i was trying it out... i simply held alt and chose the external HDD to boot into SL. (its amazingly fast and allot of improvements btw but you all knew that ) However i eventualy turned off my macbook and I disconnected the HDD and later I tried booting as normal (into my actual primary leoaprd install which is on the macbook pros internal HDD) and the grey screen on start up seems to take about 15 seconds! until the apple appears then the spinning loading circle.... this is extremely long as it only used to take about 5 seconds... I'm posting this for some help, does anyone know how I can resolve this? I tried repairing disk permissions in disk utility and that didnt help... I might try a PRAM reset anyone think this will be ok to try?