ru379 Posted June 29, 2023 Share Posted June 29, 2023 (edited) Hi, I've recentrly found an old Optiplex 990 with an i7 2700 and I would like to install big sur or monterey if it is possible to this machine, obviously with a dedicated gpu I bought. The problem is that when I made the usb installer with the EFI folder, the PC does not recognise the drive in the UEFI boot mode although it does in legacy mode but it does not work in that mode. I made the installer many times and trying other vanilla images and USBs I even tried a SSD with macOS preinstalled alredy but it does not recognise it. It only works with Windows drives. Please help me. Edited July 8, 2023 by ru379 Quote Link to comment Share on other sites More sharing options...
Administrators MaLd0n Posted June 30, 2023 Administrators Share Posted June 30, 2023 Sata ahci on bios setup? Quote -Donations- PayPal HERE - Stripe HERE - Ko-Fi HERE - BuyMeaCoffee HERE - Mercado Livre HERE Skrill danielnmaldonado@gmail.com - BTC 33HeGCuCSh4tUBqdYkQqKpSDa1E7WeAJQ3 - BNB 0x10D1d656eCa00bD521f9b4A43B83098B8142e115 - USDT BSC BEP20 0xb57cfdfa371fad1981910f0e8332409ab99f74d9 - USDT TRC20 TUR6Z9AVS4AYzqPnULoHrfFvppRbhXmNbZ - KASPA kaspa:qpxzufgfj8p6r0krg58yzvs0009h2mwqgvcawa0xc2pth7sgzpv56j4f6dtvk - PicPay @danielnmaldonado - PiX @danielnmaldonado@gmail.com Premium Users HERE - Problems with Paypal HERE Sign up for a Bybit account and claim exclusive rewards HERE New ways to earn money with Linkvertise HERE Link to comment Share on other sites More sharing options...
ru379 Posted July 8, 2023 Author Share Posted July 8, 2023 On 6/30/2023 at 4:52 PM, MaLd0n said: Sata ahci on bios setup? Yes, it was the first thing i checked with no result Quote Link to comment Share on other sites More sharing options...
ru379 Posted July 8, 2023 Author Share Posted July 8, 2023 Fixed, I switched to legacy boot and did all the necessary changes to the EFI folder to make it work. Now it is running monterey very well Quote Link to comment Share on other sites More sharing options...