So I lost my mobo in a power surge which apparently went right through my EVGA 750 SuperNova.
The board is bricked.
But when I connect the PSU to another pc it boots and runs fine.
So, here's my question as I buy a new mobo:
Is it safe to assume the PSU is fine andso safe to use on the new mobo?
Or could it be damaged and no longer be safe to use?
Cheers.

Wow that hurts
 
You were plugged directly into wall outlet --- no surge protector ?
 
I would assume nothing at this point -- test everything
 
 

Snap, time for a better surge suppressor then
 
Shipping is high - but, you do not need to ship Cables or AC cord - save some weight
 
 
Which PSU ?
 
 
some PSU are on sale today Mid Week Madness

850 BQ $39.99    with free ground ship
 
Also check EVGA eBay Store

 

Mower
The PSU was in a surge protect, the spike traveled though the PSU and into the gigabyte board that has no surge protection like say ASUS boards have.  Never another Gigabyte board again.
I know because I was right there when it happened.
 
Thanks for the RMA offer but mailing that heavy PSU to EVGA along with insurenice is pricey. 

I believe ASRock has full spike protection as well. 

Grab an UPS. 1500va is plenty

Given it is a very low end Bronze Power Supply it is as good as your House Power Provides.
https://www.evga.com/articles/00709/ This tells me time for you to buy a New PSU.
https://www.evga.com/products/pdf/120-PB-0750-KR.pdf
 

Any PSU for the most part that that is in working condition can be used but Power Supplies are Not Surge Protectors.
I would NEVER Plug in a Computer PSU in a Wall Socket, Ever.
A UPS as posted above or a very good Surge Protector.
Your PSU is over 5 Years old so you may not be under any warranty.

I would never be fool enough to not use surge protectors, the issue was caused by me when I unplugged the PSU from the surge/short and sparks shot across the plug leads.  That immediately fried the MOBO but I assume left the PSU okay.  Any chance this PSU was damagewd by the surge/short and will damage the new mobo?
Is there any point in RMAing this PSU?
 
Date Purchased: 09/11/2015
Date Registered: 10/12/2015 4:13:58 AM
 
Cheers!

Mower
Any chance this PSU was damagewd by the surge/short and will damage the new mobo?

The answer to your question is:    YES, it's possible the PSU was damaged & testing it is the only way of knowing if it is damaged
 
Because the only alternative is plug in the new MB & crossing your fingers
 
 

 
 
If the power supply worked when tested with another PC it would be safe to use. Piece of mind would be testing with a multi meter as suggested above or RMA. 

Mower
I would never be fool enough to not use surge protectors, the issue was caused by me when I unplugged the PSU from the surge/short and sparks shot across the plug leads.  That immediately fried the MOBO but I assume left the PSU okay.  Any chance this PSU was damagewd by the surge/short and will damage the new mobo?
Is there any point in RMAing this PSU?
 
Date Purchased: 09/11/2015
Date Registered: 10/12/2015 4:13:58 AM
 
Cheers!

Mower,
 
You are saying a short occurred when you unplugged the PSU. Did this short cause a circuit breaker to trip? Were you also experiencing bad weather to cause you to unplug the PSU from the surge protector? You didn't say why you did this.
 
I have found that when unplugging a device(s) from a power source, in this case your surge protector, you can sometimes get those spikes. Generally, they are associated with some sort of ongoing power draw after which is usually noticed during a break in the circuit such as unplugging the PSU. If that load/power draw was severe enough it should have caused a circuit breaker to trip. So I doubt that you caused it but instead discovered what I mentioned previously.
 
Is that PSU any good? It's hard to say. You can run tests on it using a volt meter and the voltages may be correct. But this still may not give you the full picture. Here's an example of what I mean:
Using your vehicles HVAC system there will be a fan that moves the air and a resistor block for voltage/speed control. Stay with these two items. The resistor block gets burned up so after checking the voltage (which are in specs) you replace it only to have it happen again 3 weeks (or longer) later. Rinse and repeat. This time it is 1 week later and it fails again and yet the voltage is well within spec. Now you're dealing with an intermittent issue. You get that with electronics. Replacing the resistor block and the fan cures the problem. In this case it turned out that the fan was the culprit. As the conditions changed with the fan operation it caused voltage/amperage to change causing an increase in current draw which eventually caused the resistor block to fail. Again, intermittent issues are sometimes very hard to duplicate.
 
Here's something else to think about. What if the motherboard was the initial problem and not the PSU or surge protector? I had this happen to me. There are too many variables. You just don't know and are just guessing. It's the not knowing that leaves a bad taste of uncertainty lingering around.
 
Personally, if I was in your situation I would weigh the cost of a new PSU VS the cost to RMA and let those numbers do the talking.
Considering that motherboards aren't that cheap and you have to get one I would replace both the PSU and surge protector and hope that nothing on the bad motherboard failed also.
 
Sorry for the length of this post. Good luck in your decision(s).