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Yeah, your furnace has a safety switch that shuts it down when you remove the bottom cover. You can override it by running some tape over it.
It may be a bad start capacitor that's keeping the blower motor from starting, if you feel gutsy enough you may be able to get it going with your hand, I've done that with condenser fans before. But make sure you leave the t-stat on FAN ON so it will just keep going until you can get it repaired. And do this AT YOUR OWN RISK!
Screeching is probably from a bad bushing in the blower motor, you may be able to buy it some time with some lubricant. But you're most likely looking at a new blower motor and cap.
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