Dell laptop won't power on!

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Hello,

I have a Dell Studio 1555 and it will not power on. I just got this laptop back after probably 3 years of not using it. I plugged the power cord In and the little led light next to the power plugin on the laptop blinked orange a few times and held white for a second and kept repeating that. Now when I plug it in it just has a white led for about 2-3 seconds and goes away and it won't start. I tried unplugging battery and cord and holding power button for 30 seconds. I've tried several new charges and I'm honestly not sure what's going on