The ornamental design for an all-in-one computer, as shown and described.
FIG. 1 is a top front perspective view of an all-in-one computer showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is another side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is an enlarged view of the encircled portion 8 as shown in FIG. 3.
FIG. 9 is a top rear perspective view thereof; and,
FIG. 10 is another top rear perspective view thereof as shown in another configuration.
The broken lines shown in the drawings illustrate portions of the all-in-one computer that form no part of the claimed design. The dot-dash broken lines in FIG. 3 illustrate an enlarged portion shown in FIG. 8; the dot-dash lines form no part of the claimed design.