djuby Posted November 8, 2019 Share Posted November 8, 2019 Hi everyone, I have a really wired problem with my Latitude E6420. I was able to install High Sierra on it as per the guide and bootpacks offered here. The system has Optimus - NVIDIA NVS4200 and Intel HD3000. The installation was using Intel graphics. Everything was working great until the system went to sleep in High Sierra. The power button was pulsating, which was ok, indicating that the system is in sleep mode. I pressed the power button and the system started to wake up - the hdd light was flashing and I could see the backlight of the LCD, but nothing was showing up on the screen. I waited a little more to see if anything will show - but nothing. Then I pressed the power button to turn off the system. It did, but after starting it up again there was nothing on the screen - no image whatsoever. No DELL logo, no BIOS - nothing. Is it possible that High Sierra has done something? Wrote something bad in the BIOS or whatever? Can somebody help with this problem? Any ideas will be greatly appreciated. Thanks in advance. Best regards. Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 8, 2019 Administrators Share Posted November 8, 2019 Did you install the SSDT that disables the Nvidia GPU? Link to comment Share on other sites More sharing options...
djuby Posted November 8, 2019 Author Share Posted November 8, 2019 I used the SSDT that was in the bootpack. The about this Mac was showing only the Intel HD3000. Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 8, 2019 Administrators Share Posted November 8, 2019 I can only assume you mean Jake Lo's guide. Which bootpack are we talking about here because there are several and 2 x of them are Optimus ones, i.e. those you'd need depending on BIOS version. Link to comment Share on other sites More sharing options...
djuby Posted November 8, 2019 Author Share Posted November 8, 2019 Yes. I used Jake Lo's guide. I used E6420_HD3000_A23 bootpack and DSDT for high res. My BIOS version was A26. Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 8, 2019 Administrators Share Posted November 8, 2019 Wrong pack, you need to use the Optimus A23 one. Link to comment Share on other sites More sharing options...
djuby Posted November 9, 2019 Author Share Posted November 9, 2019 OK. The question now is how to unbrick the laptop? Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 9, 2019 Administrators Share Posted November 9, 2019 Unbrick? What are you talking about? Link to comment Share on other sites More sharing options...
djuby Posted November 9, 2019 Author Share Posted November 9, 2019 Turns out my LCD died, that's why there is no image. I am replacing it and will do a brand new installation with the correct bootpack. Link to comment Share on other sites More sharing options...
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