Welcome to TSF
I regret to advise that you have probably given it the 'kiss of death'
From your description, I take it that you are ready to 'have a go' but not experienced with micro-electronics.
Rule No 1 when taking things apart. NEVER use force.
Rule No 2 ALWAYS use the correct tools for the job....
Unless you have been trained in CMOS handling and take ALL the anti-static precautions, it is a fair chance that you may have zapped something with a few thousand volts! (Body static can go as high a 50,000 + volts!)
However, check that you have seated the ribbon cables correctly.
The only practical thing I can suggest is to check your household insurance and see if the original 'accident' is covered.