Mac Pro 1,1 BOOTCAMP GPU PROBLEM.

kind of hard to say what it could be without being there. How many pcie slots does your pro have? try switching to the first or the 3rd if it has one and see how that does. If that doesn't work try sticking it in another computer if you have a spare one lying around and see if it boots up. If the first possible scenario worked, you have a bad slot, if the second scenario didn't boot the spare pc then you have a bad gpu. keep me posted.

it's an adapter yes, but if your pro has a 6 and 8 pin connectors you don't need to use it. try putting it in a different desktop and tell me what happens.

Are you sure the power supply unit can hold up to that card? I gotta admit I'm kinda stumped, I've never had any problems installing gpus and ive been building pcs for quite awhile now. Try getting another cable and use the one that came with the gpu and see what happens. also you could try a different video output, instead of hdmi maybe try vga or dvi if the card has those.

Yeah I watched it. I have had problems with that if the psu couldn't handle the card, and ive had it do similar things that yours did. Looked the psu up and it seems okay. you could always try getting another molex adapter and seeing if it works. also, try using something other than hdmi. Try all of the cord connections. Does the 570 have a m-hdmi? My old 560 ti had one and the mini hdmi isn't worth crap.

Yeah try using the adapter that came with it and see what happens. Never hurts to try.

Typically the computer will do that if there is a dead short or a power draw that it can not handle.

Check that the 8 pin plug you bought is wired correctly.

the two "extra" pins should be connected to the ground side.

If he wired those in a sensible fashion, there should be 3 yellow wires (+) and 5 black wires (-).

The 6 to 8 adapter you have can be tried if you have 2 regular 6 pin cables. One side of it will let system work with just one 6 pin connected, the other side will not.

WHat card were you using before?

Also be certain that the card isn't somehow shorting to the case. Either put a piece of plastic between card and surface, or move to another slot.

Yeah that's why I was thinking it could possibly be the psu or his connectors.

If the gpu works in another pc and not in the mac pro, you can assume there's either something wrong with the psu or with the connectors. try different connectors if you can, if that doesn't work try switching the psu out with another and see what happens.

first try using different connectors, if that doesn't work try making sure it's not touching a piece of metal or something. If that doesn't help, change the psu. I'm sure it'lll be tough to change out, all pre-built companies make it hard to remove parts, unless it's a gaming computer. I've never owned a mac pro so i can't tell you, but knowing apple it's probably kind of difficult. May I ask why you're using a mac pro for gaming when you could build a custom windows based pc and have less problems with it?

I would try an external PSU before trying to switch out the one in the Mac Pro itself. slughead has posted guides on how to do this.

Right, you probably don't need to replace the Mac Pro's PSU. An external ~450W power supply will be much, much less than $300.

Here's my recommendation. Stick the gts 450 back in the mac pro, sell it and build yourself a desktop. since you already have a good gpu you can spend the money you get from the mac pro on everything else. I would recommend the following:

Case: Coolermaster HAF 922
Motherboard: Gigabyte z68a-d3h-b3
Ram: 8Gb ddr3 1333mhz
Cpu: Intel i5 2500k (overclock it to 4ghz to alleviate any possible bottlenecks and it'll improve fps in games like skyrim)
Psu: 650Watt Modular psu so you can do cable management
Fans: 1 280mm top mounted fan (fits the haf 922), 1 120mm sidemounted fan.
HDD: id recommend getting a 64gb SSD for the operating system, and a 1tb for games and music.

You can pull out a dvd drive from any computer sitting around.

Also, yes it could be the psu. Just because it's rated for 900 watts or whatever it is doesn't mean it's necessarily "pushing out" that many. the psu could be shot.