Question New GPU - Fans Spin, No Display

Nov 6, 2020
Disclaimer: Please be aware that I am technologically incompetent, so bear with me. Thanks!

Build (according to Speccy);

OS - Windows 10 Pro 64-bit

CPU - Intel Core i5-760


Motherboard - ASUSTeK Computer INC. P7HS5-M (LGA1156)

GPU - 512MB NVIDIA GeForce 8400 GS

Storage - 465GB Seagate ST3500418AS

PSU - TR2-430W


Hey all! I recently ordered a XFX Radeon HD 7870 on ebay, but it says there's no display. When I start up the PC, there is a beeping sequence: 1 long beep, 3 short beeps, pause, 1 short beep (the same sequence happens when I turn on the PC without a graphics card installed). The GPU has two pci-e pins; one 6-pin connector, and one 8-pin connector. My PSU doesn't come with an 8-pin connector, so I just have the 6-pin plugged into the GPU. Whenever I install my old GPU (the GeForce 8400 GS), the PC boots up just fine.

What I've tried:

I've tried messing around in the BIOS settings, but I can't seem to find the UEFI option or anything (I think it's because my mobo doesn't have onboard graphics). I've also tried resetting the CMOS by taking out the battery for a few seconds and putting it back in. I have also triple-checked my connections and cables and everything seats nicely (aside from the 8-pin connector mentioned earlier which I don't have).

What I haven't tried:

I haven't tried plugging in BOTH 8 and 6 pin-connectors to the new GPU, because of two reasons; I don't want to buy a new PSU for just a theory that may or may not work, and because the fans work at a pretty fast speed so I don't suspect power to be an issue. I also haven't tried the other video output ports aside from HDMI because I don't have the cables / adapters for them.

Any thoughts? Thanks!
You don't get to choose which power cables you connect to the GPU. If it has a 6 pin and a 8 pin then it needs BOTH to work. You need a new PSU not just because you don't have the appropriate cables needed but because yours is also too old and wasn't good enough when it was new.
Reactions: HamonOverdrive
Try an adapter 6pin to 8pin if you don´t wanna spend money for a new or used PSU with 8 and 6 pin PCIe connectors, but this is really not recommended. Could hurt your whole system.

I think at least 2x6pin are necessary to run the card, but still not recommended, getting a PSU with 8+6pin is the best option you have, or sell the card and get a different one with only one 6pin connector. Like GTX1050TI, RX570 (look at cards with only one 6pin power connector),..

Be sure you have the latest BIOS version 1302 installed
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Reactions: HamonOverdrive