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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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As I read the first sentences of your issue I thought immediately that it was the power supply.
I've experienced this same issue with 300W and needing more powerful one. Same thing fans seem to turn, lights up but nothing from computer.
I believe that really is the issue.
Good luck.
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This is what it looks like... let's see what will happen after this weekend...
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Don't know if anybody has said this, but it might be the graphics drivers from the old card?...try booting in safe mode by multiple pressing the F8 key while the computer boots, you should see a Dos style menu come up that will let you choose Safe Mode (choose no graphics drivers if it gives you the option).
If you can get in safe mode, un-install the old graphics drivers and reboot back to normal mode, then install your new graphics drivers and software for the new card.
Not 100% sure that's what it is but if you have tried all the hardware things, it might be it.
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This is not the current reason as the computer is not passing the BIOS POST screen... Probably this is what will happen after the HW issues will be solved...
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If there are components that you can unplug to temporarily lower the power draw, then try that.
Additional hard drives, DVD-ROM etc.
If that works then you will know that the PSU isn't beefy enough and you need another one.
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If there were lots of things there I would test it but only disconnecting the DVD probably won't make any difference...
Anyway I'll make some testing before getting the new PSU.
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Yeah, disconnecting the DVD probably won't make any difference if there's no DVD in it.
Good luck.
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Ok those are my ideas:
- Can you try this card in another PC, it could be a damage Video Card.
- I smell that you can have a compatibility issue, try to check if you main board chip-sets are compatible with this Video Card. Not sure how old is the main boards, it could be just a setting in the Bios. (do it before plugging the Video Card)
- Try the 400Watts +, maybe that is all you need.
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Hi!
I won't be able to test the card in any other computer, and it looks like there is a compatibility issue between the motherboard and the card itself plus not enough Watts from the PSU... so I'll have to change the PSU and then do some tricks I've seen in a youtube video where they explain how to make it work with his motherboard...
Thank you for your post!
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Simple Advice: NEVER help friends or family with their computers!  ))
Honestly, it sounds like putting a new Power Supply in there will work fine.
The Wattage is the maximum output, not the amount of power FORCED into the system.
It will simply let the video card draw the extra power it needs. ($30-$60.00)
Considering your time and what the adapter costs. The power supply is probably the fastest simplest way to wrap this up.
I jumped into this thread because after Microsofts Update, a few programs started misbehaving and I had to install 7 different versions of my AMD RADEON driver to find a stable one... I was thinking I was not alone... LOL
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