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Laptop boots.... sometimes


I have an issue with my Dell Inspiron 15 3521. It mostly beeps on startup and doesnt pass a POST. However, every couple of times it boots and OS is loading... And it works until next power off / restart. I can also suspend and resume without problems.

About beeping - it beeps once so I guess it may be a motherboard failure... I tried reseting the CMOS without success.

Is there a way to omit the POST test at boot time? Why, when it manages to start, everything is ok? May this be a false positive?

My laptop had spoiled just a month after the warranty has ended. This is my second Dell laptop, previous one also had a hardware issue. I'm very disappointed and my whole respect for this brand about to disappear. For me, it looks like a planned obsolescence.

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