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PC not booting

HP Recommended
Compaq 6730s
Microsoft Windows 10 (64-bit)

Someone help.. My Compaq 6730s doesn't come on. When I try to power it on, the power button LED comes on but there is no display on the screen. Also, the AC amber LED blinks 11 times and on the 12th time is shows both blue and amber light. I took out the battery and tried using it from my wall socket but nothing comes up. None of the LEDs would blink unless I connect the battery. After sometime, it comes on and I can use it perfectly fine but when I turn it off and I don't use it for a while the problem starts again. I already changed and upgraded the memory module and also reset BIOS. I don't know what else to do.

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