Using the scale tool simply play around with the size of the polygon until it is perfect

Note that this polygon will be our 4 places for CD-rom

Now divide this polygon in 4 using the cut tool or the connect tool if you are working with edges.

Our next step is to select all the edges that will form the places for CD-rom etc. and extrude them in like so:

Detach the part which we will use to make our CD-rom (you can use some of the other 3 places there or make more than one CD-rom, RW etc. it is up to you).

Again using the inset and the scale tools make something like the picture:

This will be the place for the part of the CD-rom that you actually put CDs in. Select the border edges and extrude them in and chamfer the corner edges.

Now using the same techniques make the button the light the hole and the slider of the CD-rom. This is how you create the slider’s wheel. Make a cylinder with 100 sides.