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HP Probook 4730s, laptop turns on after a while.

HP Recommended
HP Probook 4730s
Microsoft Windows 7 (64-bit)

Hi, I have a problem with my laptop. First of all, my laptop has switchable graphics, intel, and AMD. AMD is not working for one year, I turned off it from bios. I use only Intel. The problem is not this. A problem suddenly appeared on the laptop, when I turn on my laptop, the fan is started spinning fast after 5 seconds, and no display. I am waiting like this for 10 minutes, and I am turning off my laptop by holding the power button. After this, when I turn on my laptop, everything goes normal. And when I turn off the laptop again, if a long time passes (like 10 minutes), I have to do the same. I think it turned on after something warmed up, but I don't know what is that. I have been using it this way for 2-3 months. My laptop model is HP Probook 4730s, i3-2350m, Intel HD graphics 3000. I formatted my laptop several times, took out the rams, and tried all the possibilities, disassembled, cleaned everything, changed thermal paste, but everything is the same.

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