dell xps one 20 desktop
Keep the computer restarts on its own what could be the problem?

So, I recently had the fan and heatsync is on my desktop XPS 200 because it was higher than has Parreira. After it was replaced (about a week ago) worked very well. Yesterday I turned on my computer and in about 20 minutes after I got the machine the screen went black and the computer just restarted. I have antivirus and a firewall (both are from McAfee). Then, after I I have something that said: "Checking the BIOS. After the Dell logo come and I have some other error, but was removed within 1 second so I do not couild read it. Then I hit the power button and loaded again. Now, normally when I boot my machine will speed up the fan to the first or second to then go quiet (which is normal). Now, when I hit the power button on the computer fan does not start as it normally does then it settles down and then restart the computer and do the same thing over and over. What could be the problem? It could be something to do with the fan and heatsync that was replaced?

I overheating or would u have a virus …

My Dell Dimension E520.


Dell Inspiron 15 1564 i3 4GB 320GB DVDRW 15.6 Windows 7


Dell Inspiron 15 1564 i3 4GB 320GB DVDRW 15.6 Windows 7


$999.99


This laptop features an IntelĀ® Graphics Media Accelerator HD for lush images when gaming and a 7-in-1 media reader for storing or transferring media. Enjoy video chats with friends and family using the built-in 1.3MP webcam and 15.6″ widescreen display.
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* Dell Inspiron Laptop with IntelĀ® CoreTM i3 Processor
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Dell XPS 17 3D Laptop with 3D Glasses,Intel i7-2630QM 2.00 GHz,16GB DDR3,17.3 FHD WLED AG 3D Screen,NVIDIA GeForce GT 555M 3GB graphics,1TB HD,Tray Load Blu-ray Triple Writer,Windows 7 Home Prem


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Plugable USB 2.0 Universal Laptop Docking Station with DisplayLink DVI/VGA up to 1920x1080, Audio, Ethernet, and 4 Available High-Speed USB 2.0 Ports


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Get around the limitations of your laptop or notebook with a single, simple USB 2.0 connection to any DVI/VGA monitor, keyboard, mouse, speakers, and other USB 2.0 devices which can stay on your desk; Share this common set of devices among several users with a swap of the USB cable; use the flexibility of the virtual USB graphics card to extend your Windows desktop across both displays.Performance…