I have Toshiba satellite 350D. It has integrated HD3200 and external HD3470 mobile graphics. They both are connected in dual Hybrid CrossfireX setup. I would like to disable dedicated GPU(non MXM) as it is dying and has bad artifacts. If I simply remove the bad card then laptop doesn't boot and screen is blank. As the original BIOS does not have options to switch between gpu I modified BIOS using PBE and enabled all hidden features. Now using modified BIOS I have list of CMOS settings which could allow to change this. Using symcmos tool I have changed some settings but it doesn't seem to work. Why? Are there any other settings I could try? Disable PCIE? Link to unlocked BIOS - 4shared.com/get/Li8LsNm3/TOSHIBA-SATELLITE-A350D-113_V1.html Settings I have tried: Special graphics features Primary Display Internal Graphics Mode Full CMOS/NVRAM dump. Code: ( SYMBOLIC CMOS EDITOR - Version 643710-035 ) Main Hard_Disk_Drive: Multi-Sector_Transfers: ( token 0x5D3 start 0x283 width 0x3 ) ( maximum 0x7 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] 2_Sectors = [2] 4_Sectors = [3] 8_Sectors = [4] 16_Sectors Main Hard_Disk_Drive: LBA_Mode_Control: ( token 0x5DF start 0x281 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Enabled Main Hard_Disk_Drive: 32_Bit_I/O: ( token 0x5E5 start 0x292 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Enabled Main Hard_Disk_Drive: Transfer_Mode: ( token 0x5D9 start 0x287 width 0x4 ) ( maximum 0xF default 0x0 PICK_FIELD ) =* [0] Standard = [1] Fast_PIO_1 = [2] Fast_PIO_2 = [3] Fast_PIO_3 = [4] Fast_PIO_4 = [5] FPIO_3_/_DMA_1 = [6] FPIO_4_/_DMA_2 Main Hard_Disk_Drive: Ultra_DMA_Mode: ( token 0x525 start 0x21C width 0x3 ) ( maximum 0x7 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Mode_0 = [2] Mode_1 = [3] Mode_2 = [4] Mode_3 = [5] Mode_4 = [6] Mode_5 = [7] Mode_6 Main Hard_Disk_Drive: Multi-Sector_Transfers: ( token 0x5EE start 0x294 width 0x3 ) ( maximum 0x7 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] 2_Sectors = [2] 4_Sectors = [3] 8_Sectors = [4] 16_Sectors Main Hard_Disk_Drive: LBA_Mode_Control: ( token 0x5FA start 0x2A2 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Enabled Main Hard_Disk_Drive: 32_Bit_I/O: ( token 0x600 start 0x2A4 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Enabled Main Hard_Disk_Drive: Transfer_Mode: ( token 0x5F4 start 0x298 width 0x4 ) ( maximum 0xF default 0x0 PICK_FIELD ) =* [0] Standard = [1] Fast_PIO_1 = [2] Fast_PIO_2 = [3] Fast_PIO_3 = [4] Fast_PIO_4 = [5] FPIO_3_/_DMA_1 = [6] FPIO_4_/_DMA_2 Main Hard_Disk_Drive: Ultra_DMA_Mode: ( token 0x528 start 0x21F width 0x3 ) ( maximum 0x7 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Mode_0 = [2] Mode_1 = [3] Mode_2 = [4] Mode_3 = [5] Mode_4 = [6] Mode_5 = [7] Mode_6 Main Optical_Disk_Drive: Multi-Sector_Transfers: ( token 0x624 start 0x2B8 width 0x3 ) ( maximum 0x7 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] 2_Sectors = [2] 4_Sectors = [3] 8_Sectors = [4] 16_Sectors Main Optical_Disk_Drive: LBA_Mode_Control: ( token 0x630 start 0x2C6 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Enabled Main Optical_Disk_Drive: 32_Bit_I/O: ( token 0x636 start 0x2C8 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Enabled Main Optical_Disk_Drive: Transfer_Mode: ( token 0x62A start 0x2BC width 0x4 ) ( maximum 0xF default 0x0 PICK_FIELD ) =* [0] Standard = [1] Fast_PIO_1 = [2] Fast_PIO_2 = [3] Fast_PIO_3 = [4] Fast_PIO_4 = [5] FPIO_3_/_DMA_1 = [6] FPIO_4_/_DMA_2 Main Optical_Disk_Drive: Ultra_DMA_Mode: ( token 0x52E start 0x225 width 0x3 ) ( maximum 0x7 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Mode_0 = [2] Mode_1 = [3] Mode_2 = [4] Mode_3 = [5] Mode_4 = [6] Mode_5 = [7] Mode_6 Main Power_On_Display: ( token 0x18 start 0x3F9 width 0x2 ) ( maximum 0x3 default 0x3 PICK_FIELD ) = [2] LCD+Analog_RGB =* [3] Auto-Selected Main Language: ( token 0x2C4 start 0x243 width 0x4 ) ( maximum 0xF default 0x0 PICK_FIELD ) =* [0] English_(US) = [2] Fran‡ais Advanced Legacy_USB_Support: ( token 0x3ED start 0x3FC width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Processor_Assisted_Virtualization: ( token 0x339 start 0x170 width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Built-in_LAN: ( token 0x42 start 0x3F4 width 0x2 ) ( maximum 0x3 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Wake_on_Keyboard: ( token 0x45 start 0x3F1 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Enabled Advanced Wake-up_on_LAN: ( token 0x48 start 0x3F0 width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Critical_Battery_Wake-up: ( token 0x4B start 0x7B width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Pointing_Devices ( token 0x57 start 0x7F width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Illumination_LED ( token 0x75 start 0x2A8 width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced USB_Sleep_and_Charge: ( token 0x6C start 0x294 width 0x2 ) ( maximum 0x3 default 0x0 PICK_FIELD ) =* [0] Disabled = [1] Mode1 = [2] Mode2 Advanced HDMI-CEC ( token 0x4E start 0x7C width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Remote_Power_On/Off ( token 0x51 start 0x7D width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced Internal_CIR ( token 0x5A start 0x80 width 0x1 ) ( maximum 0x1 default 0x1 PICK_FIELD ) = [0] Disabled =* [1] Enabled Advanced SATA_Controller_Mode ( token 0x4AD start 0x34C width 0x3 ) ( maximum 0x7 default 0x4 PICK_FIELD ) =* [3] Compatibility = [4] AHCI Security HDD1_Password ( token 0x3C start 0x79 width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] User_Only = [1] User+Master Security HDD2_Password ( token 0x3F start 0x7A width 0x1 ) ( maximum 0x1 default 0x0 PICK_FIELD ) =* [0] User_Only = [1] User+Master