bosch PKS 66 CE circular saw not starting

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Architecture / engineering office
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Hi all,

I have a bosch PKS 66 CE I sort of inheirited from my father-in-law when he died (he worked for bosch for years so it was quite the set) and it worked great. The blade got dull recently so I replaced it with a new bosch blade. All I removed was the blade and the riving knife and I put both back but now the machine does not start. I press the button and it's like there is no power, it just does nothing. I have tried without a blade and with the old blade back in. I can see nothing in the manual but I was wondering if anyone if familiar with bosch circular saws is there some kind of safety cut off or switch that might be triggered that I need to reset?