I run a computer repair business and I received a Compaq C series laptop that doesn't boot on power up. I took a video sample of the problem.
It just stays like that, in fact, I've left it on for 30 min.
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After spending hours trying to go through the elimination process (RAM, GPU, Fans, etc), I removed the battery and tried running on AC power only, and it worked. It booted fine and I got into the OS. I didn't know that the battery could stop a computer from booting. I guess you do learn new things every day.