Select every second row of edges and scale them out until you have something like this:
Create the hole by using a 8 sided cylinder
Place the cylinder where you think your hole should be and then select the main body of the CD-rom. Go to create/compound objects/Boolean/pick object B and select the cylinder this will create a nice hole in which by using another cylinder you can make the inner side.
After you are done just add a smooth modifier.
Using the techniques you learned create the place for the floppy.
Now create the ON and the Restart button with the little lights under them and delete the polygons that we will use to create a grill.
In the place of the deleted polygons create a rectangle and a lot of circles which will be the holes of the grill. Attach all the circles to the rectangle.