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Computer Not Turning on help plz

I went to my parent's house over the holiday break. When I left my apartment to go to their house, I shut down my computer but did not unplug it. I came back three weeks later and it would not turn on. It is a Dell desktop about two years old. All it would do was blink an orange light about twice a second. It would not turn on at all.

So I figured maybe the power supply or mobo went bad since it wouldn't power on. First thing I did was open the case and try a different power supply. That didn't work. Then I unplugged everything attached to the mobo and reseated everything, including RAM, drives, etc. Still didn't work. Then in a last ditch effort, I did something random and removed the CMOS battery from the mobo and the computer started right up without the battery.

At this point, I assumed that the battery was the problem so I replaced it with a brand new battery but the computer is still not turning on with the battery in, only with it out. Does anyone have any suggestions on what you think might be broken or what I have to do to fix this problem?

The computer is a Dell with Dual Core Pentium Processor 3.0Ghz, 3 GB DDR2 RAM, DVD drive/burner, 160 GB Seagate HDD, 8600GT Video Card, Windows XP.

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