Tried to tap del key at post and get into Cmos setup, reset the configuration , typically F6 I believe. F10 it and exit, restart.

Have you tried to tap F8 or F10 or another key "depending on your PC " at to get into safe mode? Or last known good configuration?

If that yeilds no results, Check your IDE cables, make sure they are tight. Take them off , put back on, may simply be a bad connection. However, it could be a bad IDE cable.

Also, you may have to pull the Cmos battery for a minute or two and put it back in.

If none of this works let me know.