pulleys do not move the belt and a high squeal occurs?

Likely a bad spindle bearing that is seizing up. Check by hand if any spindles feel locked or hard to turn. If so replace both the top and bottom spindle shaft bearings. Examine the shaft. If it looks bent replace the shaft also or the whole spindle assembly. Leave the spindle on the deck and just remove the shaft as the hold down bolts are very brittle and prone to breaking.