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On the motherboard, connect all power connectors,video(if you have intergrated video at this time I would just use that),cpu,cpu fan,one stick of ram. Nothing else, you can connect the front panel power-on button just to make it easier to turn on. When you have all the basics connected try to turn it on and see if BIOS comes up and the beeps go away. Do not connect HD,USB,or any thing else. If you get the same thing , swap the stick of ram with another stick. IF you get BIOS , one at a time start connecting other components and starting the system back up to make sure it boots normally. If still no chage, then it lies in your power supply , cpu, motherboard(although I know you said it's new they do at times come D.O.A).
Put just the ram back into the motherboard, the pc will not boot without processor, ram and graphics pluged into the board, check this, if it will still not boot and you still get 3 beeps its a memory(ram) problem, and you will need to replace the memory stick.
Sounds like a bad motherboard, I try resetting the bios , removing everything but the video , could be a bad power supply too (if you have one jump the wires in there as a test). you can buy those dell MBs cheap on fleabay.
Sounds like the CMOS battery on the motherboard needs replacing...i would try clearing CMOS first, replace battery and test voltage at the CPU (through the BIOS) If that dosen't help you likely have faulty capacitors. If you get it to boot, im sure drivers and BIOS will need updates if it's been stored 2 yrs.
The main reason for CPU fan overworking or not working is due to the load we put on the syatem while operating.So,the first reason for fan not working may be due to the SMPS malfunctionality.Better check out for it.The reason if fan is working but Overworking is due to viruses is system.So go in for format
If the RAM is incompatible with your board then yes it would not allow a boot. Make sure your front panel power wire is plugged into the proper spot on the motherboard and retry. If it's the RAM then you will still have the problem. If it was the wire loose or in wrong spot then it should work. Hope this helps & please remember to rate my answer. Thanks.
Here was the fix for me. The machine refuses to boot if the video card is not functioning. It should have one long beep however to tell you that there is a video problem. Someone hooked up our speaker incorrectly though! So we got no beeps. Once the speaker was hooked up and the video card was replaced, all is well!