First, is your computer unstable?
The fact you have tried two different power supplies and get the same results suggests your power supplies are good.
I would try another hardware monitor. Check out HwInfo64
. But note the amount of information it provides can be overwhelming to new users until used to the program. So when it starts, check "Sensors only" when prompted. Then scroll down to your motherboard and see what the voltages say there. If still out of the ±5% allowed tolerance range, then further troubleshooting is required.
I am not a fan of using a multimeter to test power supplies because they can be dangerous and are not conclusive. But in this case, you can verify voltages by using the meter probes in unused PSU connectors. If bad, it is possible you got two bad supplies, but that is not likely - especially not two bad with the exact same symptoms.
Every home and every computer user should have access to a AC Outlet Tester
to ensure your outlet is properly wired and grounded
. I recommend one with a GFCI (ground fault circuit interrupt) indicator as it can be used to test bathroom and kitchen outlets (outlets near water) too. These testers can be found for your type and voltage outlet, foreign or domestic, (like this one
for the UK) at most home improvement stores, or even the electrical department at Wal-Mart. Use it to test all the outlets in the home and if a fault is shown, have it fixed by a qualified electrician.
If you have a multimeter and know what you are doing, you can verify your mains voltages are correct too. But since these are definitely deadly voltages, don't do it unless qualified.
If you have an UPS on your system, most UPS have either a LCD display panel that can display the line voltage, or software that can report the line voltage, or both.
Last, there have been many reports of the ASUS Anti-Surge feature causing more headaches than it is worth for some users. If certain your mains outlet is properly wired and grounded to Earth ground, and the mains voltages are correct, you might consider disabling that feature and see what happens.