Aspire 5935G bios fault HELP

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Hi all,
   i have an aspire 5935G have black screen and i tired the acer procedure to restore the bios:
BIOS Recovery by Crisis Disk
BIOS Recovery Boot Block:
BIOS Recovery Boot Block is a special block of BIOS. It is used to boot up the system with minimum BIOS
initialization. Users can enable this feature to restore the BIOS firmware to a successful one once the previous
BIOS flashing process failed.
BIOS Recovery Hotkey:
The system provides a function hotkey: Fn+Esc, for enable BIOS Recovery process when system is powered
on during BIOS POST. To use this function, it is strongly recommended to have the AC adapter and Battery
present. If this function is enabled, the system will force the BIOS to enter a special BIOS block, called Boot
Block.
Steps for BIOS Recovery by Crisis Disk:
Before doing this, a Crisis Diskette should be prepared ready in hand. The Crisis Diskette could be made by
executing the Crisis Disk program in another system with Windows XP OS.
Follow the steps below:
1.
Plug in the USB disk.
2.
Launch the wincris.exe program to create a USB Crisis Disk. Click Start to initiate the process.
3.
Select the Quick Format option to format the disk and click Start. Follow the instructions on the screen to
create the disk.
4.
Copy the KAYF0X64.fd BIOS file into USB flash disk root directory.
NOTE: Do not place any other *.fd file in the USB flash disk root directory.
To use the Crisis USB key, do the following:
1.
Plug USB storage into USB port.
2.
Press Fn + ESC button then plug in AC power.
The Power button flashes orange once.
3.
Press Power button to initiate system CRISIS mode.
When CRISIS is complete, the system auto restarts with a workable BIOS.
4.
Update the latest version BIOS for this machine by regular BIOS flashing process.

But i have no resutl the machine have a fun but dont read from usb disk, have any suggestion
Br