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strange problem with dq77mk 1155 mobo

moebius8
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Im building a budget system from used parts, I have an i5 3470, and an mq77dk motherboard ive purchased off of ebay.

The system works the odd thing is I plug an old rx 250 (single slot low power card) works fine the board see it video initializes everything is golden

I plug in an Asus 750ti strix card works all is gold

i plug in an rx480 nothing bios shows the slot as unpopulated and only onboard video will work.

the rx480 works fine, in fact im using it on the machine im typing this post on.

The only thing i can think of is maybe the power draw is too high. there is literally nothing available on google and im at my wits end on this.

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PSU?

Main PC: R7 3700X / Gigabyte X570 I Aorus Pro Wifi / Radeon RX 5700 XT / 32GB DDR4-3200 / 250GB & 2TB Crucial MX500 (in HP Prodesk 400 Case)

Laptop: R5 2500U / Radeon Vega 8 / 8GB DDR4-2400 / 500GB SK Hynix BC501 (HP Envy x360 13)

My little Server: i7-7700 / Asrock H110M-ITX / 24GB DDR4-2400 / Samsung 860 Pro 250GB & Seagate Firecuda 2TB / VMware ESXi 6.7

(Don't tell me i should Name them, i don't want to ^^)

 

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10 hours ago, TheLaserCucumber said:

PSU?

I dont think so I tested with two known good psu's with the same result. I also tried it with an i5 2400 with the same results, Im starting to think i just ended up with a broken board.

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