Hey don't forget pulling the lever in the back of the pc downward - looking at the pic above, it's the only thing protruding from the back of the case. Pulling this spring-loaded lever down releases the side panel making the case screws redundant.
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Unplugging the computer from the wall is about all you need to do to get a "cold boot". There is a battery on the motherboard you can remove for a few minutes if you need to reset the BIOS settings. That battery is about the size of a quarter coin.
The motherboard nearly fills the bottom of a desktop system, assuming it's set on the desk with the monitor on top. If you're using it as a "tower" system, the motherboard will fill one side of the box. It's big... and may have other "cards" plugged into it.
It's one of two problems: bad power supply, or bad motherboard. If you are electro-mech inclined, remove the power supply. Take it to your local computer repair shop, and ask for one just like that one. Reinstall, power up should (most of the time) fix this problem. If still no power, you need a new mb. Return to the shop, ask them to replace mb. This repair should be right around $250.0 - tops. Any more than that - replace computer. Hope this helps. Either way, if you wouldn't mind taking the time to rate my response, it would be much appreciated! Thanx and good luck.
On most DELL desktops, there is a button on the top and bottom. If you push those at the same time it releases the catch holding the case together. When they are released the case will fold open, there is no removable panel. it is a hinged mechanism.