Hp Pavilion DV7-2120sa not booting

The laptop was cutting off after 3 seconds of turning it on(fan and the lights came on). I replaced the CPU and the laptop booted to the windows loading screen then cut off, now it only boots for about 3 seconds again with no screen just the fan and the lights coming on.
anyone know whats up with it?
Thanks
Liam

Enter BIOS setup by tapping/holding the F10 key immediately after powering on the laptop.Use Diagnostics to test your hdd.
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