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If possible disable the onboard graphics card. That might save some wattage, but I doubt it would be enough.
My plan is to live forever ... so far so good
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I'm positive that it was disable by default as the computer came with an external GPU installed a terrible one but... Anyway the new GPU specs are claiming it needs 400W which the current PSU is not capable to give... 
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Why not ??? The card draws the supply it needs, the more available, the better, but you cannot fry a motherboard because of a stronger power supply...
~RaGE();
I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus
Entropy isn't what it used to.
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That's what I thought...
I've checked it with our electrical department and those sparkies have ensured me that unless I make strange things with the cables no issues should happen installing a bigger PSU...
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The problem is likely caused by the fact that the driver for the old card is still installed. Will it start in safe mode? If it does, then uninstall the driver for the old card and install the driver for the new one.
The 400W rating for the card is probably for when the card is at peak performance, not just starting up. But, yes, you will probably need to replace the power supply in order for the card to work properly.
The difficult we do right away...
...the impossible takes slightly longer.
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Driver of OS isn't a problem here - according to the post it not even get there, but outdated BIOS may be a problem...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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not at all Richard, the OS doesn't even start...
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Hello again, Joan.
I just looked at the nVidia site and didn't see a product with the exact nomenclature you mentioned. The ones I see are GTX 570 and GTX 750 Ti. I get "Page Not Found" for the Ti version.
You should check the amperage for each voltage on the power supply and not just total combined power. The installation manual for the video card might say something like +5V @22A. If the current power supply only delivers +5V @10A, then there is a 12A shortfall and the card will most likely not work with that power supply.
Regards,
Rick
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Interesting and important detail, I'll have to check it before getting a new PSU to ensure this won't be another issue.
Thank you! 
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Another option is the PCIe port, does it support version 3.0?
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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For what I've seen in the Internet (dangerous place I know) the PCIe 3 is backwards compatible with 2.0 and therefore it should work without issue.
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That's a nice theory, and mostly true, but sometimes you need a little help from the BIOS...In any case you will loose performance...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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I could use one of those cards: my hands are freezing in here! 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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The snow still on?
Poor bastards...[^]
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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No, we had some more Friday night / yesterday morning, but that's worn out now.
It's just bitter out there, and there's no heat in my office. Normally not a problem, but I'm getting older and starting to feel the cold in my fingers. 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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That's just sad...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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If the card has an additional power connector, it must be connected. This should be mentioned in the (quick install) manual. The OC indicates an overclocked version. These usually have an additional connector.
If the current PSU did not has a power line for GPU cards, it must be replaced.
As already mentioned by others, the PSU should be replaced anyway to provide the necessary power when required.
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OK, the GPU has no extra ports to receive power...
The PSU is 300W capable.
It should be only an issue of changing the PSU for another one that could deliver >=400W. shouldn't it?
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See my other post above.
The card should work. Yours may be defective or there is general problem with this card and your system (mainboard).
[EDIT]
Another reason may be that the PSU is not able to deliver enough power upon system start. At startup most parts draw more power than during normal operation (disk drive motors are starting, fans running with max. speed).
modified 18-Jan-15 8:53am.
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Summary:
It's a relatively modern motherboard and chipset, the slot type is backward compatible, just make sure it has adequate power.
Details:
If the card recommends 400W, I wouldn't mess with that. It will need 400W.
For 300W, at best you'll get it to boot up, but it will crash and lock up for no apparent reasons. At worst, it won't boot.
Yes, PCIe 3.0 IS backwards compatible, it's not just a theory.
As another poster mentioned, boot in safe mode, uninstall the old driver, and delete the drivers.
Place the new card in, with an adequate power supply.
If there are auxiliary power ports on the video card, make sure they are supplied with the extra power they need as well.
Power it up, the system should detect the card, and if it doesn't have drivers you will need to manually select from the install disk.
One problem I had when installing a recent video card was the hardware ID of my card was not in the approved list of drivers, so it would not appear for me to even be able to manually install. I had to modify the driver's INF file and perform some other wizardry. If it comes to that though, check back.
Finally, a bios update is always a possibility, however, I have only ever had to resort to a bios update if I found instabilities in my machine, and the bios update indicated that it might fix the issue.
The bios update is the LAST thing I would attempt.
Regards,
Paul
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Hello Paul!
Thank you for your comprehensive steps list.
I'm afraid that after installing the new PSU, the problem will still be there: @Kornfeld_Eliyahu_Peter has posted this link to a youtube video in which the same problem can be seen... : https://www.youtube.com/watch?v=fkBTSlBW2oc[^]
So... I think the only real options are:
1. Return the GPU. Which I don't think it will be possible at all.
2. Buy and install a new PSU and follow all those steps... which is a PITA each time the computer must be started.
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Yes, but it is not just the PSU wattage you need to look at, you need to make sure the various power rails supply the amperage required.
I had a similar problem a few years back, and although the PSU was technically sufficient, there were a number of 12 v rails and they weren't rated to supply the juice to the gpu plugs.
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How nice it was 
I'm almost sure it should work as I've seen somebody with the same problem for a GTX750TI card which is a little bit better than my inlaw's one mounted in the same computer than my inlaw's... I truly hope this will do it. Crossing fingers here...
Thank you Dave! 
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