Does laptop HP dv7-4045 support i5-520M?
Qeeet
When bought, HP dv7-4045 is equipped with quad core i7-720QM CPU. But, unfortunately, the laptop's cooling system is badly designed and CPU somewhat aged over time. The temperature now reaches 90 degrees Centigrade and fan is very noisy.
I bought less power hungry CPU dual core i5-520M as a replace. But it didn't work. The screen never turned on and fan was spinning. Firstly I thought that the problem is somehow connected with built-in GPU sending video signal to nowhere. But pressing power on/off button it took ~5 sec to shut is off, which indicated that it froze.
From service manual (p.98): 
Does the laptop hp dv7 4045 support i5-520M or I have got faulty CPU?
Qeeet
It seems I have found a list of compatible CPUs. It is in said above service manual in chapter 1: 
Update: After further research, I have found that i7-720qm is from completely different processor family Clarksfield, while i5-560m is from Arrandale.
And indeed, I borrowed a laptop with i5-560m. So it is confirmed now. My CPU didn't work on that laptop, i5-560m didn't work on my laptop. The screen was just black, while fan was spinning.
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