So, if you were to get a bigger hard drive, do you know how to PROVISION the spaces, mark them as bootable, and LOAD an OS? Do you understand the physical connections for makeing this repair?
What you are asking is way beyond the scope of a free tech forum. Can we get some feedback on what you have done to troubleshooting the non-working monitor!
"If you can't soar with the eagles, then don't fly with the flock!" - Oliver Sykes; Bring Me The Horizon