|It sounds like a power supply issue. If there is a 115/230 voltage switch on the back of the power supply near where the power cord attaches, make sure it's in the correct position--115 in US. If you need to change it, do so only with the power cord disconnected. Unless someone messed with it, it's unlikely to be in the wrong position. Anyway, that's kind of how a computer acts if it's wrong.|
Otherwise the power supply may just be bad but there's a few other things you can check. With the power cord removed, open the case and remove all unnecessary cards and temporarily disconnect all the drives. Then reconnect the power cord and try to start it up. If you get a posting or logo screen then one of the disconnected items must be at fault.
I doubt the damage was done during storage. More likely whatever happened to it was done during the packing or unpacking process.