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Long shot, and may be too late, but have you tried the "insert" key pressed during power up? That has often done the trick.
As a rule of thumb, I dont reflash bios unless I know there is a specific feature, enhancement, bug fix the new code will fix. I dont do it casually, I DONT do it under windows. I always use a UPS power supply battery (lots of people dont realize that a power surge or dropout, brownout during flash WILL kill the chip), and always burn a backup of the old code, with the flash ute on disc also .
One method of repair if you have the identical (bios chip)model available, simply remove the old one, insert the new one and boot. Power dowm, replace the old one, and it shoul;d reprogram the bad one. Done wrong, can crack the chip(s) or even hurt the replacement one if not handled correctly.
A new bios chip is available for about $30 from 3rd level aftermarket companies, or the mobo manufacturer can reflash it, but shipping mobo is expensive plus the new chip cost.
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