Black screen in BIOS virtualization mode

The problem was present out of the box.
If I boot Macbook Air into any non MAC OS, BIOS based OS, installed on BOOT CAMP partition or from a USB stick: DOS, Windows 7, Linux etc., there is 95% chance that the screen remains black. The system boots and responds, it is only that I can see nada, just a black screen. It is possible in Windows 7 to rotate display using Ctrl+Alt+Arrow keys, and it resets video system, so after 20-30 attempts I may be lucky and get the screen on.
In other words, in 95% cases video system in BIOS mode fails to initialize.
The notebook passes all Apple standard hardware test. The motherboard(with CPU, memory) was changed with no success. SSD remains the same.
I spent some hours with Apple support, the person I spoe to came to a conclusion that there is some kind of a problem with EFI.
Then she went to holidays, and a new guy told me that the problem is that Boot Camp is not compatible with Window 7 Enterprise.
A serviseman in Apple Certified Center thinks the problem is in the Windows drivers. What a low level of professionals they have!
They all fast to blame Windows.
External display is black too.
I tryied to boot from rEFIt, and the problem remains, but the success rate of non black screen is higher, maybe 20%.
Boot ROM verison: MBA41.0077.B0F
SMC: 1.73f63
Reset of SMC did not help.
I do not know how to proceed, Apple seems to be not interested, its support keeps suggesting absurd things...

Does turning off »Use Graphics Processor« in the Performance Preferences and restarting Photoshop have any bearing on the issue?

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Hello again Hazarika.
I'll keep an eye out for your reply to make sure the issue is resolved.
I hope you have a Happy Holiday!
Please click the white star under my name to give me Kudos as a way to say "Thanks!"
Click the "Accept as Solution" button if I resolve your issue.

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Hello @milence,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
I hope this helps!
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MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Quote from: Calj25 on 04-October-13, 19:15:21
I went to this page
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Hello backstabber,
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Quote from: Svet on 19-August-13, 22:20:56
you can do >>Clear CMOS Guide<< with power cord removed and try to boot with 1 memory stick only in 1st DIMM near to CPU slot
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Hello...
Just as the headline states, I've got no display in BIOS and DOS. It all happened when I installed my new Connect3d ATI Radeon 9600XT on my K7T266 Pro2-RU-board. It runs fine in Windows and games, but when I try to enter BIOS or do a dos-startup the screen is black. I can still see the POST-screen (or whatsitcalled, the very first screen that lists my bios and discs).
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aso

Quote
I meant to adjust my previous statement about firmware being a driver, but sort of left it hanging. Firmware is not much more than a recognition string of text, isn't it?
The firmware itself is just like your mainboard's BIOS, a piece of embedded software. The videocard uses it to function, bootup, initialize and be initialized, correctly. If the firmware is missing or corrupted your card won't bootup. It will be initialized by most utilities as long as the graphic chipset remains intact.
The Output of the firmware is in most cases just a sign on string...
Quote
Could there be some BIOS-setting I've missed? There are quite a few AGP-parameters in there.
Sorry to say, but the answer is no. The only thing you 're able to change is the BIOS POST-display mode. To change the BIOS POST-display mode change the initial display mode (this is called in most Setup Utilities something like 'Full Screen Logo Show'). Setting the initial display mode to silent (=full screen logo enabled) will switch display mode at POST-Screen to 640x480x8 GRAPH or 640x480x24 GRAPH. Setting it to BIOS (=full screen logo disabled) will switch display mode to POST diagnostic screen mode (in your case 640x480x4 GRAPH, but also in many cases 640x350x4 TXT which would result in your case in a blank screen).
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Black screen in BIOS virtualization mode

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