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The humming noise you hear is the fuel pump. It is probably your starter soleniod. If you hear an electric click under the dash near the steering column when you turn the key then the ignition switch is ok and your starter needs to be replaced. This happened to me last month.
does it have a chip key?
and does your dash lights come on when you turn the key on?
if it doesnt have a chip key and the dash lights come on then turn the key too run position put on the ememency brake and try jumping across the starter, if it startes the probleb is in the netural safty switch!!
I agree with gasitjr. I own a 98 blazer. When you try to turn over the engine. Does the engine rotate? If yes,it's not the starter or the battery. When you turn the key into the ON position before it starts can you hear an electric motor noise winding up? If yes , the fuel pump maybe OK but if the pump pressure is bad...blazer wont start. Pump runs about 300 plus labor. I've done it..It sucks
did you turn the key fully to towards the dash? take the steering wheel left and right slowely and at the same time turn the key back and forth several times slowly. there is a detent inside the steering column that allows you to ingage the neutral safety switch. this should help.....please rate this thanks.
There are no free full diagrams on the net, you need to charge and test the battery, clean the battery cables and run a voltage drop test as well, replace them if the are badly corroded. Kragen will test the battery for free.