There is no reason he would need a complete new system unless maybe his water coolant bursted and soaked his MB while it was on.

If your CPU is still shutting down at 60c.. its not a thermal shut down. Thermal shutdows happen usually around 85c - 90c (You can find this exact number by checking your bois setup). Anything below c70 is running within normal operating parameters.

If its still happening when the CPU is at c60, than it is most likely the original issue we discussed.. and that would be PSU.

If your CPU is running at c60 or below I would say you don't really need to wait to use your PC.. as c60 will not cause harm. However.. if its not overheating and still shutting down, that doesn't sound like you can really use it anyway.

Just chill out and wait for that new PSU.. Hopefully it will fix all the problems. But seriously.. I would remove your water cooling unless you are up keeping it on a monthly basis, and just install some decent heatsink and fan setup.