Is there a possibility of running any OS X (leo preferably) on this hardware? Seems that my PC is NOT EFI compatible. Well... when installing Kalyway Leo 10.5.1 my computer reboots after showing up the line saying that EFI is now loading.

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Intel Pentium 4
Northwood, MMX, SSE, SSE2
Socket 478 mPGA

Matsonic motherboard
CHipset VIA P4X266 (VT8753)
SOuthbridge VT8233 (well, I dont think that matters)
AGP 4x

Actual BIOS:
Award 60.PG

RAM: 
DDR1 1,2Gb MB 133,3MHz PC3200
(1024+256, same parameters)

Graphics:
ATI Radeon 9550 PRO / X1050 (256 MB)
Agp, 4x, however, that "manager" in Windows see 2 two identical graphic cards (?)

DL-DVD/RW, CDRW, 1 HDD 250 GB ATA 133, 
Pentagram WiFi PCI card
Sagem USB WiFi Stick
4x USB PCI controller (doesnt work under XP SP3, worked as USB 1.1 on SP2, works fullspeed under Linux)
WinFast TV Tuner
USB Mouse /PS2 Keyboard
No FDD
No ethernet controller
Well, this motherboard in theory have a FireWire controller built-in, but I cant see it ;p

It almost works. iDeneb lets you install, but not boot...


...yet.

Did you used a patched kernel? like speedstep?

Maybe you can try tiger...

well, this is what i get, no-matter-what i do: http://www.mroofka.vot.pl/pliki/newErr.JPG

iDeneb 10.5.5. + [HowTo]: Fix for "using 10485 buffer headers and 4096 cluster IO buffer headers." - InsanelyMac Forum
and now im working to get QE and networking.