The ornamental design for door panel for computer base unit, as shown and described.
FIG. 1 is a perspective view of a door panel for computer base unit showing my new design;
FIG. 2 is a perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left view thereof;
FIG. 6 is a right view thereof;
FIG. 7 is a top view thereof, with the opposite side being a mirror image;
FIG. 8 is a cross-sectional view thereof taken along line 8-8 in FIG. 3; and,
FIG. 9 is the perspective view embodying the utilization of door panel for computer base unit in which the broken line is for illustrative purposes only and forms no part of the claimed design.