See this attached picture, this is the mode that SHIFT+F4 should be trying to use.
Can you try in Screen Options to click this button (the one shown in white here) and see if it works? 800 x 600 16 bit (no Hz number)
Oct 17 01:17:26 LFS : 0.5Z19
Oct 17 01:17:26 timer resolution 1 ms
Oct 17 01:17:26 read config
Oct 17 01:17:26 get command line
Oct 17 01:17:26 preinit d3d
Oct 17 01:17:26 number of adapters : 1
Oct 17 01:17:26 adapter 0 - valid modes : 98
Oct 17 01:17:26 SHIFT+F4 should use 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 01:17:26 SHIFT+F4 mode is 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 01:17:26 load bans
Oct 17 01:17:26 load font
Oct 17 01:17:26 -----
Oct 17 01:17:26 max texture size 8192
Oct 17 01:17:26 can do shadows
Oct 17 01:17:26 can use 2x tex
Oct 17 01:17:26 can do multi tex
Oct 17 01:17:26 can use dynamic tex
Oct 17 01:17:26 can use compressed tex
Oct 17 01:17:26 create english file
Oct 17 01:17:26 load language
Oct 17 01:17:26 initialisations
Oct 17 01:17:26 human system
Oct 17 01:17:27 tables
Oct 17 01:17:27 helmet
Oct 17 01:17:27 controllers
Oct 17 01:17:27 load objects
Oct 17 01:17:27 default light map
Oct 17 01:17:27 start intro
Oct 17 01:17:27 end of initialisation
Oct 17 01:17:27 init sound
Oct 17 01:17:28 TRYING to go full screen : 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 01:17:36 TRYING to go full screen : 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 01:17:40 shutting down
Oct 17 01:17:40 free objects
Oct 17 01:17:40 free languages
Oct 17 01:17:40 free controllers
Oct 17 01:17:40 clear light map
Oct 17 01:17:40 close sound
Oct 17 01:17:40 free humans
Oct 17 01:17:40 free font
Oct 17 01:17:40 free helmet
Oct 17 01:17:40 free host list
Oct 17 01:17:40 kill graphics
Oct 17 01:17:40 save calibrations
Oct 17 01:17:40 save controls
Oct 17 01:17:40 save views
Oct 17 01:17:40 save config
Oct 17 01:17:40 free mouse
Oct 17 01:17:40 EXIT
Oct 17 00:19:34 LFS : 0.5Z19
Oct 17 00:19:34 timer resolution 1 ms
Oct 17 00:19:34 read config
Oct 17 00:19:34 get command line
Oct 17 00:19:34 preinit d3d
Oct 17 00:19:34 number of adapters : 1
Oct 17 00:19:34 adapter 0 - valid modes : 116
Oct 17 00:19:34 SHIFT+F4 should use 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 00:19:34 SHIFT+F4 mode is 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 00:19:34 load bans
Oct 17 00:19:34 load font
Oct 17 00:19:35 -----
Oct 17 00:19:35 max texture size 4096
Oct 17 00:19:35 can do shadows
Oct 17 00:19:35 can use 2x tex
Oct 17 00:19:35 can do multi tex
Oct 17 00:19:35 can use dynamic tex
Oct 17 00:19:35 can use compressed tex
Oct 17 00:19:35 create english file
Oct 17 00:19:35 initialisations
Oct 17 00:19:35 human system
Oct 17 00:19:35 tables
Oct 17 00:19:35 helmet
Oct 17 00:19:35 controllers
Oct 17 00:19:35 load objects
Oct 17 00:19:35 default light map
Oct 17 00:19:35 start intro
Oct 17 00:19:35 Blackwood
Oct 17 00:19:35 end of initialisation
Oct 17 00:19:37 Next LOD
Oct 17 00:19:37 Next LOD
Oct 17 00:19:37 Next LOD
Oct 17 00:19:37 Meshes : 34
Oct 17 00:19:37 init sound
Oct 17 00:19:42 TRYING to go full screen : 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 00:20:02 shutting down
Oct 17 00:20:02 free objects
Oct 17 00:20:02 free languages
Oct 17 00:20:02 free controllers
Oct 17 00:20:02 clear light map
Oct 17 00:20:02 close sound
Oct 17 00:20:02 free humans
Oct 17 00:20:02 free font
Oct 17 00:20:02 free helmet
Oct 17 00:20:02 free host list
Oct 17 00:20:02 kill graphics
Oct 17 00:20:02 save calibrations
Oct 17 00:20:02 save controls
Oct 17 00:20:02 save views
Oct 17 00:20:02 save config
Oct 17 00:20:02 free mouse
Oct 17 00:20:02 EXIT
Oct 17 01:19:53 LFS : 0.5Z19
Oct 17 01:19:53 timer resolution 1 ms
Oct 17 01:19:53 read config
Oct 17 01:19:53 get command line
Oct 17 01:19:53 preinit d3d
Oct 17 01:19:53 number of adapters : 1
Oct 17 01:19:53 adapter 0 - valid modes : 120
Oct 17 01:19:53 SHIFT+F4 should use 32 bit / 60 Hz / width 1280 / height 720
Oct 17 01:19:53 SHIFT+F4 mode is 32 bit / 60 Hz / width 1280 / height 720
Oct 17 01:19:53 load bans
Oct 17 01:19:53 load font
Oct 17 01:19:53 -----
Oct 17 01:19:54 max texture size 8192
Oct 17 01:19:54 can do shadows
Oct 17 01:19:54 can use 2x tex
Oct 17 01:19:54 can do multi tex
Oct 17 01:19:54 can use dynamic tex
Oct 17 01:19:54 can use compressed tex
Oct 17 01:19:54 create english file
Oct 17 01:19:54 load language
Oct 17 01:19:54 initialisations
Oct 17 01:19:54 human system
Oct 17 01:19:55 tables
Oct 17 01:19:55 helmet
Oct 17 01:19:55 controllers
Oct 17 01:19:55 load objects
Oct 17 01:19:55 default light map
Oct 17 01:19:55 start intro
Oct 17 01:19:55 Blackwood
Oct 17 01:19:55 end of initialisation
Oct 17 01:19:57 Next LOD
Oct 17 01:19:57 Next LOD
Oct 17 01:19:57 Next LOD
Oct 17 01:19:57 Meshes : 38
Oct 17 01:19:57 init sound
Oct 17 01:20:06 TRYING to go full screen : 32 bit / 60 Hz / width 1280 / height 720
Oct 17 01:20:17 TRYING to go full screen : 32 bit / 60 Hz / width 1280 / height 720
Oct 17 01:20:22 Race setup : data\veh\XR GT TURBO.veh
Oct 17 01:20:35 TRYING to go full screen : 32 bit / 60 Hz / width 1280 / height 720
Oct 17 01:20:43 Race setup : data\veh\XR GT TURBO.veh
Oct 17 01:20:54 Garage : data\veh\XR GT TURBO.veh
Oct 17 01:21:02 Race setup : data\veh\XR GT TURBO.veh
Oct 17 01:21:25 TRYING to go full screen : 32 bit / 60 Hz / width 1280 / height 720
Oct 17 01:21:31 Exit : clean up
Oct 17 01:21:31 Exit : draw background
Oct 17 01:21:31 Exit : delete
Oct 17 01:21:31 Race setup : data\veh\XR GT TURBO.veh
Oct 17 01:21:33 shutting down
Oct 17 01:21:33 free objects
Oct 17 01:21:33 free languages
Oct 17 01:21:33 free controllers
Oct 17 01:21:33 clear light map
Oct 17 01:21:33 close sound
Oct 17 01:21:33 free humans
Oct 17 01:21:33 free font
Oct 17 01:21:33 free helmet
Oct 17 01:21:33 free host list
Oct 17 01:21:33 kill graphics
Oct 17 01:21:34 save calibrations
Oct 17 01:21:34 save controls
Oct 17 01:21:34 save views
Oct 17 01:21:34 save config
Oct 17 01:21:34 free mouse
Oct 17 01:21:34 EXIT
Oct 17 01:27:48 LFS : 0.5Z19
Oct 17 01:27:48 timer resolution 1 ms
Oct 17 01:27:48 read config
Oct 17 01:27:48 get command line
Oct 17 01:27:48 preinit d3d
Oct 17 01:27:48 number of adapters : 1
Oct 17 01:27:48 adapter 0 - valid modes : 98
Oct 17 01:27:48 SHIFT+F4 should use 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 01:27:48 SHIFT+F4 mode is 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 01:27:48 load bans
Oct 17 01:27:48 load font
Oct 17 01:27:48 -----
Oct 17 01:27:48 max texture size 8192
Oct 17 01:27:48 can do shadows
Oct 17 01:27:48 can use 2x tex
Oct 17 01:27:48 can do multi tex
Oct 17 01:27:48 can use dynamic tex
Oct 17 01:27:48 can use compressed tex
Oct 17 01:27:48 create english file
Oct 17 01:27:48 load language
Oct 17 01:27:48 initialisations
Oct 17 01:27:48 human system
Oct 17 01:27:49 tables
Oct 17 01:27:49 helmet
Oct 17 01:27:49 controllers
Oct 17 01:27:49 load objects
Oct 17 01:27:49 default light map
Oct 17 01:27:49 start intro
Oct 17 01:27:49 Blackwood
Oct 17 01:27:49 end of initialisation
Oct 17 01:27:52 Next LOD
Oct 17 01:27:52 Next LOD
Oct 17 01:27:52 Next LOD
Oct 17 01:27:52 Meshes : 34
Oct 17 01:27:52 init sound
Oct 17 01:27:55 TRYING to go full screen : 32 bit / 60 Hz / width 1680 / height 1050
Oct 17 01:28:01 shutting down
Oct 17 01:28:01 free objects
Oct 17 01:28:01 free languages
Oct 17 01:28:01 free controllers
Oct 17 01:28:01 clear light map
Oct 17 01:28:01 close sound
Oct 17 01:28:01 free humans
Oct 17 01:28:01 free font
Oct 17 01:28:01 free helmet
Oct 17 01:28:01 free host list
Oct 17 01:28:01 kill graphics
Oct 17 01:28:01 save calibrations
Oct 17 01:28:01 save controls
Oct 17 01:28:01 save views
Oct 17 01:28:01 save config
Oct 17 01:28:01 free mouse
Oct 17 01:28:01 EXIT
Oct 17 01:35:29 LFS : 0.5Z19
Oct 17 01:35:29 timer resolution 1 ms
Oct 17 01:35:29 read config
Oct 17 01:35:29 get command line
Oct 17 01:35:29 preinit d3d
Oct 17 01:35:29 number of adapters : 1
Oct 17 01:35:29 adapter 0 - valid modes : 134
Oct 17 01:35:29 SHIFT+F4 should use 32 bit / 60 Hz / width 1920 / height 1080
Oct 17 01:35:29 SHIFT+F4 mode is 32 bit / 60 Hz / width 1920 / height 1080
Oct 17 01:35:29 load bans
Oct 17 01:35:29 load font
Oct 17 01:35:29 -----
Oct 17 01:35:30 max texture size 8192
Oct 17 01:35:30 can do shadows
Oct 17 01:35:30 can use 2x tex
Oct 17 01:35:30 can do multi tex
Oct 17 01:35:30 can use dynamic tex
Oct 17 01:35:30 can use compressed tex
Oct 17 01:35:30 create english file
Oct 17 01:35:31 initialisations
Oct 17 01:35:31 human system
Oct 17 01:35:33 tables
Oct 17 01:35:33 helmet
Oct 17 01:35:33 controllers
Oct 17 01:35:33 load objects
Oct 17 01:35:33 default light map
Oct 17 01:35:33 start intro
Oct 17 01:35:33 end of initialisation
Oct 17 01:35:33 init sound
Oct 17 01:35:40 TRYING to go full screen : 32 bit / 60 Hz / width 1920 / height 1080
Oct 17 01:35:45 TRYING to go full screen : 32 bit / 60 Hz / width 1920 / height 1080
Oct 17 01:35:56 shutting down
Oct 17 01:35:56 free objects
Oct 17 01:35:56 free languages
Oct 17 01:35:56 free controllers
Oct 17 01:35:56 clear light map
Oct 17 01:35:56 close sound
Oct 17 01:35:56 free humans
Oct 17 01:35:56 free font
Oct 17 01:35:56 free helmet
Oct 17 01:35:56 free host list
Oct 17 01:35:56 kill graphics
Oct 17 01:35:56 save calibrations
Oct 17 01:35:56 save controls
Oct 17 01:35:56 save views
Oct 17 01:35:56 save config
Oct 17 01:35:56 free mouse
Oct 17 01:35:56 EXIT