Xbox 360 3 Red Lights (2 Questions)?

Hi
My xbox has got 3 rrod and i have followed a guide to fix it. It says to overheat it for 20 mins and then it should work but i still have 3 red lights. What can I do??? Also at the moment when i turn it on it makes a sound and then the fan cuts out, what is wrong???
Thanks in advance

Suggestion:

red ring its quite common but unfixable just turn your xbox in for a new one sorry…

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