Please enter the early startup menu immediately after power-on and start without startup-sequence. Then run check4gb from the DOS prompt and save the log.
Now edit s:startup-sequence and remove both loadide and idefix.
Reset and let it boot. Run check4gb again and save the log as a different name.
Then open a Shell window and enter
Let it boot and run Check4GB a third time and save the log again.
Attach all three logs here and describe which partitions were visible when.