How to recover my G5

What does the kernel panic message say with regard to the type of panic?

What does the message say immediately after "Backtrace"?

The Data Access error (panic type) could be memory, CPU cache or connected storage devices and their respective cache.

Remove any PCI cards (other than the graphics card) and disconnect all external devices except one monitor, mouse and keyboard.

Does the currently installed hard drive have an OS installed on it?

Try starting to Safe mode (hold Shift while starting).

Try booting to a Retail OS X install disc.

Hold a mouse click while starting to open the optical drive.

Hold C to boot to the OS install disc.

Chopper51, lets back tract here to your first post where you said the hard drive gave out. What were the symptoms that the computer was having that lead up to that? When you purchased the new hard drive were you able to get a operating system installed to it?

Your error messages point towards ram or ram slot failure.

I'd like you to put the original hard drive back in the computer. Then start it with all the ram removed and then turn off the computer. Then put one ram stick in only and try starting the computer, if it don't start, then remove that ram stick and try it in another slot and keep repeating this process in different ran slots. Until you have tryed all slots. You could also try using different ram sticks while doing this.

It'd be good to find a copy of the ASD 2.6.3 and see if it will boot to the test CD that one makes with the file.

It's all low level so runs on even severely compromised machines, but if one can't boot to an ASD disc, well, even that's telling; no logic.

Unable to find driver for this platform "PowerMac11,2".

Is your machine a Quad?

If so, check for LCS leaks.

LCS leaks:

PowerMac G5 Coolant Leaks/Repairs

PowerMac G5 Coolant Leak Repair/Overhaul (w/photos)

Repair/Overhaul of PowerMac G5 Liquid Cooling System and CPU ...

G5 leak and corrosion.htm

Google Search Results

ASD is the Apple Service Disk, a test suite used by Apple Service technicians.

The test is far more comprehensive than the Apple Hardware Test (AHT) that is available on original software install discs.

The ASD software is not available to the public, BUT, there are some files in the wild, available to those who search.

If you have the AHT, you might try that.

I worry, though, as the panic seems to indicate the inability to achieve logic (processor function). This is shown by the "kernel trap" report, "data access" panic, crash at calling of RISC function/driver and the inability to find the PPC driver from install disc.

The latter, the inability to find driver is common with those who try and use software install discs that shipped with a different machine.

Gray, OEM discs may only be used with the machine which they shipped. Even within the same model, there are different builds of the software that may result in a panic.

Use of Intel machine discs on a PPC machine will always result in that type of panic (Unable to find driver for this platform "PowerMac11,2".)

Use of a build earlier than necessary will result in the same.

The Late 2005 G5 (Quad included) had two builds that shipped.

http://support.apple.com/kb/HT2191

This is why, in my initial suggestions, I stated "Try booting to a Retail OS X install disc.", Retail being key.

Can you count the beeps or flashes?

1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images in the boot ROM (and/or bad sys config block)

5 beeps = processor is not usable

In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.

Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.

If you're sure the RAM is good, try the Hair Dryer trick...

http://discussions.apple.com/message.jspa?messageID=13240047#13240047

https://discussions.apple.com/thread/3061091?answerId=15223603022#15223603022#15223603

https://discussions.apple.com/thread/2620983?answerId=15499912022#15499912022#15499912

https://discussions.apple.com/thread/3175959?answerId=15613068022#15613068022#15613068

https://discussions.apple.com/thread/3270112

https://discussions.apple.com/thread/3287993?answerId=16053892022#16053892022#16053892

No power light at all...

https://discussions.apple.com/thread/3692775?tstart=0

It can show on any G5, and even many other computers & electronic devices of the period.

http://www.macintouch.com/reliability/pmg5.html

http://lowendmac.com/ppc/power-macintosh-g5.html

And see this last one in particular...

https://discussions.apple.com/thread/3507385?answerId=16781690022#16781690022

Heat gun better...

https://discussions.apple.com/thread/3916312?tstart=0