Hi latinoguy,
Some thoughts:
E5200 is good enough. I built a full system on the ES2l with no issues. I moved to a Q9550 because I was doing heavy image processing.

DSDT : One problem could be that your DSDT may be very different. DSDT is, in very crude terms, a representation of the hardware configuration by the BIOS to the software. Hence, just having the same chipset does not help all the time.

If you find a good DSDT for your motherboard/BIOS version out somewhere, use it. Getting the DSDT from the OSX system is not good enough; it just returns the one you just put in. A good way to get a DSDT is to download a Linux live ISO (Knoppix, Ubuntu, etc.), burn it to a CD and boot from it. Create a terminal window, and type:

sudo cat /proc/acpi/dsdt > DSDT.aml

Then you use DSDTSE app in the ES2L Kit to patch it, compile it, and save it to either the / and/or the /Extra folder(s).
There are fixes that you have to make; see OP.

Rebuild the /Extra/Extensions.mkext with the MKextTool, Kext Utility, or the command line. See posting by me and followups to it.

Make sure the permissions are correct: use the Disk Utility to fix it, not the script.

Clean all caches and retry