Back in 2012 I purchased a Dell Alienware M17x (N05WYM01) laptop for my son, which he outgrew a number of years ago and passed back to me as he no longer needed it.  Around a year ago, my trusty old Acer final failed so I started to use the Dell again and it has been quite good.

That was until yesterday, when it suddenly switched off and there was an electrical burning smell and a short zizzling sound!  When it happened, the laptop had been switched on for around an hour and plugged into the mains.  However, it had been sitting on a footstool and I wonder if possibly the air flow had been affected and it over heated and caused this apparent electrical failure.

The power supply is still working.  When I plug it in and press the power button, there is no discernible noise that indicates it is starting up, however, the keyboard backlight comes on.  The two fans (CPU & GPU?) visible on the back of the laptop are not working and nothing is displayed on the screen.

If the issue was caused by overheating, I'm wondering if it can be repaired and if there is likely to be a single part (or two) that could be replaced.

The laptop is obviously useless to me in its current state and its only value is as scrap, so if I can get some cheap replacement parts I would possibly attempt to replace them and try to revive it.

I would appreciate any help/advice you could give.