If you are the original owner, or if the Inspiron 9300 is now registered to you, Dell will fix it for a small price of about $36 plus shipping. And it will work afterwards. Some methods used by some on this forum make it impossible to ever password again, and sometimes render it unusable.
Talk to Dell Tech Support on the phone... as for a US Based tech support person if you are in the US. You can actually download your old invoice online from Dell Support.
Talk to Dell Tech Support on the phone... as for a US Based tech support person if you are in the US. You can actually download your old invoice online from Dell Support.