GreenTrees Posted April 28, 2011 Share Posted April 28, 2011 If I boot Windows then restart into OS X my display doesn't work, showing either plain grey or black, the system seems to have booted up as when I tap the power button there is hd activity, then press Enter & it shuts down. On the next restart it'll do the same, safe mode restores things to normal, from which point it'll restart perfectly every time, providing I don't run Windoze ! Display is Intel GMA (Device ID: 0x2a02) kernel.log shows display: Not usable. My HpG7000 Laptop boots OS X 10.6.7, Windows 7, Windows XP & Ubuntu. Switching between Windows / OS X / Ubuntu is done via Chameleon M$ handles the switch of W7 / XP Even if I restart before Windows has actually loaded (Ctrl/alt/del) at the Windows 7 / Windows XP choice screen I get the same problem and oddly the problem doesn't occur if, after Chameleon I restart at Ubuntu's Grub screen. Display kext is AppleIntelGMAX3100 1.6.26.31 Graphics enabler = Yes in com.apple.Boot.plist Any ideas please, I've been searching / googling / battling with this for days now ! Many Thanks -GT Quote Link to comment https://www.insanelymac.com/forum/topic/255874-multiboot-after-windows-sometimes-display-not-usable/ Share on other sites More sharing options...
mulcyber Posted April 29, 2011 Share Posted April 29, 2011 I have two drives. If I use F12 to choose which hard drive to boot from, and choose my second hard, where Snow Leopard is installed (Chameleon), it boots up fine. But then if I close down SL and choose restart, and then pick Windows which is installed on the first drive (and normally my default) I get "missing operating system". But if instead I choose to shutdown SL (not restart) when I turn the computer back on it defaults to the first drive (Windows) and I get the Easybcd menu where I can choose Win7 or WinXP and there is no missing OS, it works fine. My idea is to turn off the computer in between using the computer on one drive and then switching to the OS on the other drive. I don't think you will have to reboot twice to switch over. And though it takes 10 seconds longer to turn off rather than restart, that is still faster than having to restart twice (or your etc.). Since this happens to both of us (in general), I think that is the way it works, and would need a developer to fix it. Or I could restart the computer from SL, and at the Bios boot screen, I could tap F12 and choose the first drive to boot from. I don't think that is much quicker and do you have a Bios that supports the F12 functionality or a different F key to do it? Windows is in the MBR of the first drive. Chameleon is in the MBR of second drive. To make that work to boot linux, also on the SL drive, I had to install Linux to the root of the linux drive not the MBR. This option will show up if you choose the manual (advanced) option early in the install of Ubuntu (or other linux OS). I have two linux distros sharing with SL. One uses grub legacy and the other grub2. One of them appears/boots in the Chameleon boot menu and the other in the Easybcd menu?! Anyway, this fix is very easy to try, shutdown rather than restart. Maybe it isn't a problem related to which drive you first boot to, affects switching to another OS on the other drive. Once I had the wrong driver installed for Snow Leopard ethernet connection to the internet. It didn't work. And when I rebooted into Windows it wouldn't work either, although it did before, starting from Windows. SL was freezing up my ethernet port making it unavailable, reaching a hand from beyond the grave. I had to turn the computer off. Then also unhook the power cord to reset that condition! Finally, when lin2mac released his wonderful ALC81xx driver, then both OS worked right. Quote Link to comment https://www.insanelymac.com/forum/topic/255874-multiboot-after-windows-sometimes-display-not-usable/#findComment-1676081 Share on other sites More sharing options...
GreenTrees Posted May 2, 2011 Author Share Posted May 2, 2011 Hi mulcyber, being a laptop, all is on the one hard drive here, but much the same, a proper "turn-off" and it's fine, had wondered if if was something I was missing, hence the post. Cheers & thanks again -Gt Quote Link to comment https://www.insanelymac.com/forum/topic/255874-multiboot-after-windows-sometimes-display-not-usable/#findComment-1677990 Share on other sites More sharing options...
mulcyber Posted May 3, 2011 Share Posted May 3, 2011 Hi mulcyber, being a laptop, all is on the one hard drive here, but much the same, a proper "turn-off" and it's fine, had wondered if if was something I was missing, hence the post. Cheers & thanks again -Gt You are welcome. It's a relatively painless workaround. I think it's related to a restart doesn't completely flush ram but a complete shutdown does clear ram. I think it has to do with bad drivers not exiting properly but since I'm not a developer, I couldn't fix it even if I knew the exact problem. Hackintosh used to have a cmos reset bug, which to me was an unexpected side effect. Quote Link to comment https://www.insanelymac.com/forum/topic/255874-multiboot-after-windows-sometimes-display-not-usable/#findComment-1678114 Share on other sites More sharing options...
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