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Disclaimer: Please backup your data before attempting any part of this guide MacTipsNow holds no responsibility for any damage or loss of data.
This guide assumes you have basic OSx86 knowledge, you should be able to follow along ok if not, but please don't be afraid to ask questions I will do my best to help. This guide is wrote from my experience installing OS X Snow Leopard 10.6.8 on my Dell Dimension 9200, just because it works for me doesn't necessarily mean it will for you, our hardware could be slightly different but in reality you should have no problems if you follow this guide step by step.
Please check your hardware against mine, most likely you'll have a different graphics card, but hopefully you have one that's OS X compatible. To find out if your graphics card is OS X compatible search google with "<your cards model number here> OSx86 compatibility" if you need help figuring out how or if your card will work please comment below.
Intel Core 2 Duo 2.66Ghz - Any stock installed Dell CPU will work.
6GB RAM - Only have 4GB during install - Might work with 6GB.
1TB SATA HDD.
nVidia 8400GS graphics card.
Step 1: Downgrade your BIOS to (1.0.3 for 9200.) I'm unsure if its the same for the XPS 410?. (This helps with hard drives not showing up during installing, it might not be needed but it was for me.)
Step 2: Set BIOS to raid off / Auto ATA.
Step 3: Get iBoot and follow this GUIDE to install snow leopard. (Update to 10.6.8 with the combo update & use Multibeast but follow Step 4 before rebooting).
Step 4: MultiBeast, what to check 1. EasyBeast. 2. System Utilities. 3. Under Kexts & Misc, ElliotForceLegacyRTC, &, IOUSBFamilyRollback. 4. Under OSx86 Software. Kext Utility.
DON'T REBOOT YET!
Step 5: Goto /Extra/Extension and delete AHCI_3rdParty_SATA.kext & JMicron36xATA.kext.
Step 6: Install the kexts HERE using Kext Utility App, just select all and drop on the Kext Utility App icon. (Possibly drop in /Extra/Extensions after as well).
Step 7: Repair Disk Permissions in Disk Utility App. (found in Applications > Utilities)
Step 8: Reboot and enjoy Snow Leopard 10.6.8.