steps
1.try to clean the RAM, ensure no dust. And try to boot again.
2.remove the keyboard blow the dust. Fix it try to start.
3.If the above fails, Remove cmos battery and laptop battery and press power button for 15 seconds. This will remove charges. Fix it again the last step is superb, it helped me a lot.
4. This problem may be caused by failing RAM,therefore you can test with a working one
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