|"Here's a link to the review that convinced me to buy it:..."|
That review is for XFX ProSeries 650W !
There is no such thing as an HFX brand of power supplies !
"There is only one six pin plug on the back of either card".
I took another look on the web, and apparently PNY's own info about the card is NOT correct, and many vendors are quoting that same incorrect info.
The picture above this text in this review shows one 6 pin power socket, not two.
"The rear of the card sports sports two Dual-Link DVI connectors and a single mini-HDMI connector, standard on modern Nvidia cards. No VGA port here for those of you who may be looking, but there is a VGA-to-DVI converter included in the accessory package as we saw earlier".
"There is, however, a supplied "6 pin PCIe to Molex Power Adapter" cable""
The picture above this text in this review shows that wiring adapter:
"Inside the box, PNY has included a good accessory package for this price range card, with a Quick Start Guide, driver installation disk, a Molex-to-PCIe power cable, mini HDMI-to-HDMI connector, and a DVI-to-VGA connector"
You use that only if the power supply has no 6 pin PCI-E power connector available, or if the card has two 6 pin sockets, only if the power supply has only one PCI-E 6 pin connector, for the second power socket.
It can supply enough current at +12v because it sources the +12v power from two molex connectors from the power supply.
Did you connect BOTH the main 24 pin connector AND the 4 pin connector to the power socket near the PCI-E X16 slot from the power supply to the mboard ?
It's extremely rare for there to be anything wrong with the PCI-E X16 slot circuits unless you damaged them yourself by doing something you shouldn't have done.
ATX mboards are always powered in some places, including some of the contacts in the PCI-E X16 slot, even when the computer is NOT running, as long as the power supply is connected to the mboard and the power supply is receiving live AC power.
Did you REMOVE the AC power to the power supply when you plugged in or unplugged the video card at ALL times ?
Did you have the video card all the way down in the slot and have it's bracket fastened with a screw to the case BEFORE you booted the computer ?
If you didn't do either of those things, you have have damaged the PCI-E X16 slot's circuits or the video card's circuits.
The video card can be checked to see if it still works by connecting it to another computer, the proper way, that has at least a 450 watt power supply.
Or if you can't do that on another computer of yours or of a friend's, you could have a local place that repairs computers check it out for you.
"I actually bought the recertified one which pretty much looks the same.My card came with zero documentation other than the "installation" disc. "
A recertified card, a.k.a. a refurbished card, is one that was returned by some customer.
There may have been nothing wrong with it, or the customer may have returned it because they couldn't get it to work for whatever reason. Presumably it's been tested since it was returned and was found to work.
It may not come with all of whatever originally came with the card
It's often cheaper than a new card because it has been returned..
I have an XFX HD 5450 card in it's original box sitting here. It comes with printed installation instructions as well as the CD.
There are probably installation instructions in at least one of the documents on the CD. E.g. That may not be in the main manual, but it may be in a Quck installation guide or similar.
Also, there are often generic instructions for installing a video card in the mboard's manual.