I've just purchased and installed a new EVGA SuperNova P2 650 W Platinum PSU.
Now, every time I start my computer, within about 5 minutes Windows 10 gives me a warning: "Display driver stopped responding and has reovered".  When this happens the screen temporarily goes black, but then starts working again.  Very soon after this, the image breaks up then goes black and the monitor goes into standby as though it is no longer receiving a signal.
Anyone any idea why this is happening?  Unless I can stop this happening I'll have to return the PSU.
 
Thanks.

Old psu didn't cause this issue?

Sorry, for not supplying all my PC info, it was late and I didn't have time, but will supply it soon (just out at the moment).
 
I can confirm the issue did NOT happen using my old PSU, so this is something that is either being caused by the new PSU or possibly I caused it to happen while swapping the PSU's.  I can also confirm I have used only cables supplied with the new PSU,except some modex adapters to a couple of fans, but these are still connected to the supplied peripheral cables.
 
I will try checking the BIOS settings.
 
The reason for changing my PSU was due to the old one not always starting first time when I pressed the power button.  It was often necessary to isolate the power by turning off the PSU power switch and leaving it for a few minutes, then flicking it back on and it would usually start.  I got into the habit of turning off the PC, then switching off the PSU.  Before pressing the front case button to start the PC I would flip the PSU switch on.  This has ALWAYS worked over the last couple of weeks, but I purchased the new PSU in the hope of not having to do this.  I'm also planning a rebuild soon, so wanted more available power.
 
I confess I'm very surprised that swapping out the PSU should give me a video card issue!
 
I'll get more info regarding the machine spec. when I have time later and post it, but I'm not convinced this will provide any information that would be useful to solve this issue.  I will also try the other VGA cable that came with the PSU just in case.  I'm also thinking of putting back the old PSU to see if the issue goes away.  If it does, this would prove I haven't "damaged" anything while swapping the PSU's, but obviously it's a bit of a pain to have to unplug everything again.
 
Thanks for the help so far.

bcavnaugh, just to confirm I used ALL the new cables from the new PSU, so not sure why you get the impression I didn't!  Two VGA cables were provided with the PSU and I have now tried both of them, but still get the problem, so it doesn't identify an issue with one of the new cables.  This includes the mains power cable.
 

bcavnaugh
Do Not Use Or Mix Power Cables of Different Make and Model unless approve by the Manufacture.

I haven't mixed them, ALL the cables used came with the new EVGA PSU.
 

EVGATech_JosephL
Once in, you need to look for the output on +12V, output needs to be between 11.4 and 12.6, if the output is outside that range, that can be the cause of your driver issues.

The +12V value is showing 12.302.

Left the computer switched on and showing the BIOS health settings so I could monitor the temperatures.  Left the room and came back 10 minutes later (after typing the previous post on my laptop) only to find it had shutdown.  Nothing I do will get it to start up again!!!  It looks like the new PSU has failed or possibly fried my system.  The internal components were VERY hot, even with the side and top of the case removed.
 
Time to try putting the old PSU back and fingers crossed it starts.
 

milleniumaire
I can confirm the issue did NOT happen using my old PSU

Sounding like a bad psu.

I've put back the old PSU and the computer still wouldn't start.  I disconnected everything except the motherboard and the PSU started up.  Added devices one at a time and determined it is the graphics card that is causing the problem.  Whenever power is connected to the graphics card the computer won't start, so unfortunately it looks like the new EVGA PSU has ruined my graphics card.  My guess is that Windows was detecting an issue and shutting down the graphics, but when it was in BIOS mode, there was no Windows OS to monitor what was going on and the PSU fried it.
 
What should have been a simple process of swapping over the PSU's has resulted in a waste of a lot of my time and a ruined expensive graphics card.  It looks like my rebuild will be brought forward, unless I can find a reasonably priced second hand card to keep me going for a few more months.
 
Needless to say the EVGA SuperNova P2 650 W Platinum PSU will be going back to Amazon and I'll be staying clear of this brand in the future.
 
A disappointing and frustrating weekend!

Probably a little late, but just in case anyone else reads this post, the graphics card that has been fried is a Gigabyte Nvidia GeForce 8800 GT 512mb GDDR3.
The motherboard is a Gigabyte GA-X38-DS5 socket 775 and the CPU is an Intel core 2 Duo E8400 Socket 775.  It has 4gb Kingston Hyperx DDR2 memory.
 
Aging technology, but the 2 x SSD drives allow it to still perform perfectly well for my current needs.  Correction, DID allow it to perform well!  RIP.

Graphics cards can fail at anytime. Just because your old graphics card decided to fail when replacing psu doesn't mean the new psu caused the card to fail.