Yep, “Recently, gaming particularly “heavy” games, it blue screens or freezes with blocks/stripes of green/white/purple.” thats a sign of a dying/deadGPU. If the GPU in this machine is modular and can be replaced it is a simple and relatively inexpensive fix if you have the right part. However, if the GPU is soldered to the motherboard that would require a motherboard replacement which is by far not the easiest thing to replace and it will be costly.