Display Panel or Portion Thereof with a Computer Icon

FIG. 1 is a front perspective view of a handheld computing device showing the new design for a display panel or portion thereof with a computer icon according to a first embodiment; FIG. 2 is a front view thereof; FIG. 3 is a front view showing a first image of a sequence incorporating the design according to a second embodiment; FIG. 4 is a front view showing a second image of the sequence thereof; FIG. 5 is a front view showing a third image of the sequence thereof; FIG. 6 is a front view showing a fourth image of the sequence thereof; and, FIG. 7 is a front view showing a fifth image of the sequence thereof. Broken lines in FIGS. 1 - 7 show portions of a computing device with the display panel or portion thereof or portions of the computer icon and form no part of the claimed design. The appearance of the transitional image sequentially transitions between the images shown in FIGS. 3 - 7 . The process or period in which one image transitions to another image forms no part of the claimed design.