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i don't remember any issues like that with mine. you don't have enough info on your profile to discern what you're working with, guessing it's some variant of the 530 since you're posting in this thread... do some digging, most startup/shutdown/sleep issues mentioned about these are usually...

here's the link for the bios forum. let me know if you make any progress https://www.bios-mods.com/forum/Thread-Dell-Inspiron-530-530s-v1-0-2-Experimental-Unlocking-Upgrading-Project?page=16

it's been happily running 10.6.8 for a couple years now. i'm trying to upgrade to el capitan because some apps & services i use are starting to break functionality because of the now old/unsupported OS. i have hit same wall you have with the upgrade. i created a unibeast installer with el...

enabling raid, enables ACHI. (even though it's not stated as such, at least on the factory dell bios 1.0.18 for the G33m02, only one i have to refrence)

if it's the default bios, just change "ata" to "raid" in the sata peripheral properties in the bios, when you reboot, you'll see an extra screen that says about ACHI/RAID info before the bootloader starts.

currently running 10.6.8 on dell 530s & desperately trying to get newer os on it as it's finally starting to loose functionality/support with some apps/services i need to use. (chrome, dropbox, etc...). managed to create an el capitan uniboot with clover legacy & nvida for the GeForce 8400 GS...