Never Ever Ever Ever Ever Ever Ever Ever use a Molex to PCI-E adapters for graphics cards. Second, can your PSU even handle the card you have as it sounds like the GPU is not getting enough power? What model and brand of PSU do you have? Because if you are using a cheapo no name junk PSU that comes with all cheap Dell, HP, Lenovo computers and such, then it's the weak 250-300 watt PSU that is not providing the power needed. Also, if your PSU does not have it's own dedicated PCI-E power connectors for the graphics card, then you will need to buy a good solid 500W or higher quality PSU. Don't buy cheapo no name PSU's that advertize high power but are unknown or very cheap as they are literally very cheap and will burn out your PC because they are just junk.
Buy a quality 500W+ PSU from Corsair, EVGA and such for example. A GTX 970 will NEED a quality 500W+ PSU to function good and one that can also push the amps needed for the GTX 970, your 300W cheapo no name chinese junk PSU does NOT have the power needed for the GTX 970, you need to buy one now if you want to use the GTX 970.
Last but not least, when you buy a new PSU, make sure that the PSU comes with 2 independent PCI-E power connectors because the GTX 970 requires 2. If you bought a PSU that only has 1, return it if you can and you must buy one that has 2 for the GTX 970. I hope it's your PSU, did you ever change out the PSU since that thread you made a bit ago?
If you need help in buying a good PSU, I can help you, just give me a budget and I will find the best PSU for the price, the PSU to me is the single most important part of your PC as it powers everything. It means having to spend a bit more, but it pays off to have a good quality PSU that will last you for a long time too.
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