Does not boot after replace the HDD cable
I was using my MBP 2010 booting from an external drive cause the HDD cable was broken, then two days ago I replaced the cable and now it doesn't boot. Everything makes noise running, but after 5sec the MPB turn off and then turn on again and continuing until I press SHIFT+CTRL+OPTION+POWER to turn it off.
I made a record: https://youtu.be/iocJlE1y-go
Can anyone help me, please?