How many first gen PS3s are affacted by and how can I avoid YLOD?

How many first gen PS3s are affacted by and how can I avoid YLOD? - Crop faceless tattooed artist taking paint bottle from heap of multicolored spray cans placed on ground on street of city

I want to buy a second hand 1st gen PS3. What are the odds that I'll be affected by a YLOD and how can I prevent it?

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How many first gen PS3s are affacted by and how can I avoid YLOD? - Crop anonymous person in sneakers with tattoo and heap of multicolored spray paint cans on ground standing on street in city

How many first gen PS3s are affacted by and how can I avoid YLOD? - Multicolor Heart Shaped Candies

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Why PS3 YLOD happens and how to prevent it

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Felicity Tai, Felicity Tai, Molly Champion, Su Korkmaz