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<blockquote data-quote="cichy202" data-source="post: 1547727" data-attributes="member: 314094">Thank you all for suggestions!This iMac is not mine, one of the clients uses specific software that requires Windows 7 32bit (not my choice anyway <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" /> ).Anyway, I have installed all drivers again (4.0.4033) and turned it off. I cleared NVRAM and SMC and turned it on again. Surprisingly it booted just fine but when I tried turned on Aero the screen started to flicker and went dark again. Then I thought: there must be sth wrong with the graphics card. I rebooted to OS X and when I started stress testing GPU the screen started to flicker again and went dark again.So everytime the GPU load rises above certain level, graphics card goes crazy. So now whenever I boot to OS X everything is fine until I run some tests. Under Windows it is also fine unless tests it as well.All in all, weird symptoms, but this iMac is simply broken.Thanks again for help!</blockquote>

[QUOTE="cichy202, post: 1547727, member: 314094"] Thank you all for suggestions! This iMac is not mine, one of the clients uses specific software that requires Windows 7 32bit (not my choice anyway ;) ). Anyway, I have installed all drivers again (4.0.4033) and turned it off. I cleared NVRAM and SMC and turned it on again. Surprisingly it booted just fine but when I tried turned on Aero the screen started to flicker and went dark again. Then I thought: there must be sth wrong with the graphics card. I rebooted to OS X and when I started stress testing GPU the screen started to flicker again and went dark again. So everytime the GPU load rises above certain level, graphics card goes crazy. So now whenever I boot to OS X everything is fine until I run some tests. Under Windows it is also fine unless tests it as well. All in all, weird symptoms, but this iMac is simply broken. Thanks again for help! [/QUOTE]

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