Hi citrus, the rrod in xbox360 is typically caused by a solder ball under the gpu or cpu that doesn't make a good contact with the motherboard. The kit you're talking about just makes more pressure over the chip so the contact that is not working hopefully starts to work again. The fact that you didn't find any thermal paste is very unlikely, the reason you didn't find it I think it's because somebody already tried to fix it. You can try the kit since that is not expensive but I can already tell you that if it luckily starts working again it won't last for a long time. If you're interested you're probably going to need a reball done by a technician and I think they will ask you 40-60$, but that's the real fix for the problem. Bye.