So my friend recently finished building his computer, asrock z68 extreme4, 2500k, 6870 1gb, corsair 600t, all with an hx 750. But when he powers up his comp, nothing shows up on teh screen, and the fans run a lot slower than usual ( using 3 pin connectors not the controller). But when he takes out the power plugs on the gfx card the fans run full speed, and he is prompted to insert the boot disk and stuffs. Could it be a bad power supply? Or maybe we have to install drivers for the card?
PSU Corsair HX 750 is a good and very very strong for HD 6870, there seems to be a technical error between VGA, try to power the computer with VGAonboard first, to ensure that the PSU works fine. if the result is smooth, then certainly HD6780 is in trouble,
- Pairs and pairs of cables HD 6870 Two 2x4 pin and make sure VGAOB disabled from bios.
- Try to turn on the computer if a problem ...?
Drivers aren't required for the Radeon HD 6870 discrete graphics card to be able to display the POST screens because the operating system hasn't even begun to load.
POST has to be successfully completed before control is passed over to the bootable device to begin loading of the operating system.
Has the Radeon HD 6870 graphics card been tried out in another system?
Is the Radeon HD 6870 graphics card in the PCIE2 slot?
Has your friend connected two modular 6+2 pin PCI Express supplementary power cables from the Corsair HX750 to the Radeon HD 6870 graphics card?
When your friend pulled out the power plugs on the graphics card that essentially disabled it causing the onboard IGP to be used instead.
In the ASRock UEFI Setup Utility what is the Primary Graphics Adapter setting set to? This setting allows you to select [Onboard], [PCI] or [PCI Express] as the boot graphics adapter priority. The default value is [PCI Express].
Has a different graphics card been tried in the system?