you've likely either broken or caused the cogs to jump which is jamming the drive,
if it were a desktop drive id say to open it up and attempt to correct the problem, laptop well, have a look for a maintenance manual for it, see if the drive is removable, if it is take it out and see if you can open it.
i did try and find the manual but kept finding pay sites which is annoying.
you could try contacting acer directly for help.
i did find this site - http://safemanuals.com/user-guide-instructions-owner-manual/ACER/ASPIRE-5050-_P
but im not sure if its legit so be careful.
you could be cheeky and look into rma or warranty, buuut not sure how far you will get with that.