if the desktop is not coming up or on it can be several things if its not coming up when its powered on it can be a corrupt windows file holding the start up process. if its not powering on at all then it can be a short either in the usb,harddrive, etc. or the power supply could be shot it could be other hardware that is dead and not allowing it to function.
your screen refreshes when you close a program causing your desktop icons to flicker
Try turning the Bluetooth off.
An output device, such as a monitor (screen), or a printer.
You need to have your internet turned ON. You also need to download ROBLOX onto your desktop. If it isn't there, drag it there.
Desktop
Adjust your keyboard on the computer settings by right clicking desktop then personalize...hope this worked :)
right click on desktop and properties desktop customize desktop and select icon to view it on your desktop and click OK
The Desktop image can be changed in from Desktop tab in the Desktop & ScreenSaver section of System Preferences. You can jump directly to this by right clicking on the Desktop and selecting Change Desktop Background.... from the menu that appears.
Desktop
You arrange your desktop
Desktop-destroyer.net
My HP pavillion(Name on my computer) desktop is the regular desktop on my computer