XFX HD 6870 HD-687A-ZNFC Intermittent Black Screen on boot Tags: Radeon Boot HD Graphics Last response: April 18, 2012 5:43 AM in Graphics & Displays Share hidef-UK April 16, 2012 1:09:39 PM Hi All If anyone can shed any light on this problem I would be grateful. I have recently done a new build ... CPU - i5 2500k (running @ 3.3 ghz) MOBO - Gigabyte GA-Z68X-UD5-B3 RAM - 8gb Crucial Ballistix DDR3 1600mhz SSD - OCZ Agility 3 GPU - XFX XFX HD 6870 HD-687A-ZNFC PSU - Akasa PowerMax 1000W Gaming PSU (bought in 2008) Power on from cold boot = OK no problems everything is working fine Reboot from OS = OK no problems everything is working fine This build is for a Hackintosh Project and Snow Leopard 10.6.8 is running like a dream, with no Kernel Panics However irrespective of the OS ... If I power off from OS and imdediately power back on and boot I get a black screen and my monitor goes to sleep. Although I have no display the motherboard seems to boot fine. I have tried another GPU PCI E GT 240 ... powered via PCI E 16 lane no pin connectors required and this works fine .... with zero problems So my suspicions point to the PSU ... even though I am using 2 seperate 6 pin PCI E power connectors. I have ordered a new PSU Corsair HX650 which should arrive soon ... I am hoping this should correct the problem ... however if it doesnt ... does anyone have any ideas? More about : xfx 6870 687a znfc intermittent black screen boot blazorthon April 16, 2012 2:15:41 PM You might have a faulty 6870. If you have another computer lying around, then maybe you could put your 6870 into it and see if it still has this problem. hidef-UK April 17, 2012 6:19:31 PM blazorthon said:You might have a faulty 6870. If you have another computer lying around, then maybe you could put your 6870 into it and see if it still has this problem. Thanks Blazorthon got my new Corsair HX 650 PSU today and the problem is fixed ... just goes to show that a good wedge of our budget should always be towards a new high quality PSU Can't find your answer ? Ask ! Get the answer blazorthon April 18, 2012 5:43:19 AM I didn't even think of that. A high quality PSU bought only three years ago should still work, so I didn't think to mention it. Of course, I'm not very familiar with Akasa, so I don't know if that is a very high quality brand like Corsair is. Can't find your answer ? Ask ! Publish Related resources: ForumXFX Radeon HD 6870 : Screen randomly goes black . ForumBlue screening, need help please! ForumXFX Radeon HD 7850 Black screen during boot ForumBlack screen , buzzing noise, Phenom II X6 ForumXFX Radeon HD 6870 Stuttering ForumSapphire HD 5770 FleX 1GB GDDR5, is it HDCP compliant? ForumInstalling new driver for XFX AMD Radeon 6870 causes Windows to freeze ForumXFX Radeon HD 7850 Black screen during booting ForumLow Frame Rate with XFX HD 6870 ForumXFX HD 6870 DUAL FAN, CRASHING / NOT WORKING PROPERLY. ForumI want to build and would like some help. ForumNeed help building a gaming rig for under $1000 Forum5760x1080 Eyefinity on HD 7870 ForumLaptop screen problem "The screen turns on but no light." ForumUpgrading 6870: GTX 680 or XFire 6870s? ForumPower Suppy for XFX 260 BLACK ED ForumFull screen game disables second monitor Forum6870 Crossfire issues Forum[Solved] Radeon 6870 CPU slowdown Forum[Solved] Sapphire 7870 shows only half screen in bios More resources Read discussions in other Graphics & Displays categories Ati GPUs Graphics Cards Gtx HD Monitors SLI Crossfire Tuner Cards Radeon Video Diamond Multimedia Matrox Nvidia Palit PowerColor Asus Games !