I have downloaded Leopard-10.5.2-AMD-EFI-Rev2 and burn it at 2x speed. When I boot the DVD a menu popped up saying press any keep to start or F8. So i pressed any key and then i went to this grey screen with the apple logo. Few minutes later a stop sign appeared on the apple logo and it was still loading
What should I Do.
My computer specs:
http://support.gateway.com/s/PC/R/5876/5876nv.shtml

Does it give you an X?

It can either be your integrated video card or IDE Hard drive.

Feature Specification
Processor AMD Athlon™ 64 X2 dual-core processor 3800+

* 2.0 GB
* 2000 MHz front side bus
* L2 cache: 512 KB x2

# Memory Installed: 1024 MB 400 MHz (PC3200) DDR memory (two 512 MB modules)
# Expandable to: 4 GB
Video Integrated
# Integrated Audio Interface: AC97
# Model: Realtek ALC653
Hard Drive 250 GB 7200 RPM IDE hard drive
# Optical Drives Double layer 16X DVD+/-RW drive
# 16X DVD-ROM drive
Media Reader 9-in-1 Digital Media Manager supporting the following:

* CompactFlash Card
* IBM MicroDrive
* Memory Stick
* Memory Stick Pro
* SmartMedia Card
* Secure Digital(SD)/MMC
* Compact Flash
* Multimedia Card
* xD-Picture Card
* USB 1.1 or later

Modem 56K ITU V.92 ready Fax/Modem
Network Integrated 10/100 LAN
# Interfaces PS/2 keyboard port
# PS/2 mouse port
# Seven USB 2.0 ports (four on rear panel, two on front panel, one in media reader)
# Three IEEE-1394a connectors (one on rear panel, two on front-panel)
# One parallel port
# One RJ-45 LAN port
# Five audio jacks (three on rear panel, two on front panel)
# Add-In Card Slots One PCI-Express ×16
# One PCI-E ×1
# Two PCI Conventional
# Drive Bays Two external 3.5-inch
# Two external 5.25-inch
# Two internal 3.5-inch
# Input Devices Multimedia keyboard
# USB optical mouse
Speakers Amplified stereo speakers
Dimensions (H × W × D) 15.4 × 7.3 × 17.9 inches
Weight 23.5 lbs (computer only, no packaging)

boot off from the disc press [ENTER], and try again. should work, can't be a DVD problem, or if you want go into -V (verbose mode), and from there tell us what errors do you see.

put in the same IDE channel, your HD & DVD (master/slave) and unplug the other dvd.

WinLinMac01, i did what you told me to and this is the message i got at the end.

ERROR:
Panic (CPU 0 caller 0x002D68EE:'nfs_boot_init failed with G\N"@/sourcecache/xnu/xnu-1228/bsd/nfs_vfsops,c:85

Debugger called <Panic>

BSD process name corresponding to current thread: Kernel_task

Mac OS version: Not Yet Set

Kernel Version
Darwin Kernel 9.0.0-Tue Oct 9 21:35:55 PDT 2007;root:xnu-1228~1/RELEASE_I386
System model name: GT 5028

kisho, did you already try roisofts suggestion? :)

actually i didn't get the message i made my hardrive master and my dvd slave is that what he meant.

You DVD should be master. Your DVD Drive is IDE, right?

yes my DVD Driver is IDE
Edit: What should my HardDrive be then?

HD=master DVD=slave (not cable select) (same ide channel) unplug the other ide device or disable the second ide channel in bios.