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Because in that case you get power via the board, and it maybe can't handle it...
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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But it is a "maybe"... 
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The 400 W is the recommended power that must be supplied by the PSU. It is not the power required by the GPU card.
Form the Nvidia homepage for the GTX750 (normal version):
Max. power consumption: 55 W
Min. PSU pwoer: 300 W
Your GPU seems to be an overclocked version ("OC") that might draw more.
The PCIe x16 slot is able to provide about 75 W. If the card requires more power, an additional connector must be provided.
Overall the card should work but the PSU might be at its limit when the GPU card is at full power.
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Jochen Arndt wrote: The PCIe x16 slot is able to provide about 75 W. If the card requires more power, an additional connector must be provided.
Overall the card should work but the PSU might be at its limit when the GPU card is at full power.
And keep in mind that power supplies degrade over time. What started out as a 300 watt power supply may be down to 285 or less. The symptoms you describe sounds exactly like the time I forgot to plug in the extra power cables on one of my video cards (rookie mistake, I know).
Also, double check that the PCI versions are compatible. Some video cards may not be compatible with older revisions.
Finally, I'm not sure how it is now, but a few years ago, say 2005ish, HP and the other manufacturers had custom pinouts on their power supplies so keep that in mind if you're going to replace it.
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Had not seen your post milo-xml, my idea was to go to the shop with the PSU under the arm just to check the connections and to be able to ask for adaptors if needed... 
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OK, nice to know that...
I've been searching the Internet a lot to solve this and I've seen that everyone under the sun is recommending to upgrade the PSU at least to 500W to ensure no problems related to the PSU will appear... this should not be expensive and probably is the path I'll follow.
Thank you for posting!
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I have 2 GTX760OC cards (SLI) in my gaming PC and they require 2 sets of power cables directly from the PSU. I had to buy a 1000w PSU to power everything.
Your card doesn't look too much older than mine, but maybe I'm just showing off 
My plan is to live forever ... so far so good
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The PSU you bought is ridiculously oversized for the cards you've got running with it. At stock those cards are 170W; even OCed they're unlikely to be above 200W each. With a 100+W CPU and heavy OC the rest of your box might be another 200W. A 750/850W PSU would be more than plenty to run your system at full load (I'd learn toward the latter for headroom if your next pair of cards are significantly more power hungry), and would be much more efficient when your system is at idle. 1000W is overkill for anything below a 3way GPU or 2CPU 2 GPU system.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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I also have 2 SSDs plus a normal drive, 32Gb RAM, and several more USB devices, not sure how much difference any of that makes. One day when my current 8Gb VRAM is no longer enough I can plug another 2 graphics cards in. The problem then will be that they will run at 8x, while I'm currently running at 16x. That's probably a question for next year though.
My plan is to live forever ... so far so good
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DJ van Wyk wrote: I also have 2 SSDs plus a normal drive, 32Gb RAM, and several more USB devices, not sure how much difference any of that makes.
Not much. Mainstream processors are ~90W, top end ones ~130W; the 200W everything else figure I used covered a lot of stuff plugged into the mobo.
As for more GPUs; dropping from 16x to 8x won't matter for anything graphics related or for most compute tasks; the exception being if you're doing a lot of CPU-GPU IO instead of handing off large independent blocks of computation and waiting for the results back.
However, regardless of what you're using it for buying two more 760s next year would be a waste. SLI/xFire both scale much worse above 2 cards; to the extent that a few years ago I saw some tests showing that 4 cards wasn't meaningfully faster than 3 in most games and actually was slightly slower in a few. 2 cards to 3 still gave a decentish bump but it wasn't close to the 50% theoretical gain; generally for the same money 2 faster cards would beat 3 slower ones; making 3way setups only worthwhile when you'd already gone to the top normal single GPU cards (eg 780 but not Titan).
For compute, it'd still be a poor buy because GPU performance scales with moore's law, and two new cards would outperform 4 old ones while using a lot less power even if you could find another two 760s; which by then you probably won't. Used cards run the risk that it's people who run their cards the hardest that are most likely to sell; and from personal experience 2-3years of 24/7 GPU compute will kill a lot of cards.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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You are just showing off! 
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It seems that your PCIe version is 2.0 - it should not be a deadly problem but you will not get the maximum out of a board with version 3.0...
You may see this: https://www.youtube.com/watch?v=fkBTSlBW2oc[^]
(Consider to recycle the board graphics card...)
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
modified 18-Jan-15 9:14am.
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I don't think they'll want to recycle the board... Too much money involved to play a couple of games.
And I don't think the shop will agree returning the GPU...
How nice!
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Yeah - not nice...
Do you have the opportunity to borrow a PSU with 400W?
You may check it with that...
Jochen Arndt may be all right that the problem is at the power-on state, when all moving parts are spinning at top speed...
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 won't be able to borrow it from anywhere, but it looks like someone has posted a video explaining the steps to get it working so I'll get the PSU, and make the testing, let's hope it will work.
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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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