Hi everyone. Hope someone will be able to help since Apple isn't doing anything. They say they are trying but ???? Here's what's going on. I decided to upgrade my perfectly working Powermac G5 Quad with 5gb of ram to Leopard the next day it came out and i have been having proplems ever since. My computer is crashing, freezing and even getting some Kernel Panic. Most of the time it's happening while running simple aps. like iTune, mail or iPhoto. I sometimes hear a cliking sound comming from my tower and then it will crash. A few times, (4) all my fans started blowing like crazy and i had to hard reset my computer with the power button. I re-installed Leopard a few times now and it's still the same. At one point, iPhoto wouldn't even open. I ran all the hardware test with the install disk and everything seems ok. Here's the message i got last night after my fans started going crazy and got this Kernel panic: Sun Nov 18 20:28:53 2007 panic(cpu 3 caller 0x010476B4): "ATA Device recovery failed\n"@/SourceCache/IOATABlockStorage/ IOATABlockStorage-200.1.8/IOATABlockStorageDriverV2.cpp:2325 Latest stack backtrace for cpu 3: Backtrace: 0x0009AD18 0x0009B6BC 0x00029DC4 0x010476B4 0x010478D4 0x007810E8 0x0078181C 0x00784CF8 0x00785A14 0x00784AF0 0x00784774 0x01066D58 0x00784704 0x003566C0 0x007846AC 0x01066C98 0x0077FBAC 0x01047624 0x01047748 0x010478D4 0x007810E8 0x0078181C 0x00784CF8 0x00784F20 0x01069008 0x00784E24 0x0078C0B0 0x0003F8D8 0x000AFE54 Kernel loadable modules in backtrace (with dependencies): com.apple.iokit.IOATABlockStorage(2.0.0)@0x1044000->0x1056fff dependency: com.apple.iokit.IOATAFamily(1.7.3f1)@0x77e000 dependency: com.apple.iokit.IOStorageFamily(1.5.2)@0x628000 com.apple.driver.AppleK2SATA(1.0.4f2)@0x1065000->0x1069fff dependency: com.apple.iokit.IOPCIFamily(2.4)@0x683000 dependency: com.apple.iokit.IOATAFamily(1.7.3f1)@0x77e000 com.apple.iokit.IOATAFamily(1.7.3f1)@0x77e000->0x78ffff Proceeding back via exception chain: Exception state (sv=0x744c6280) PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown) BSD process name corresponding to current thread: kernel_task Mac OS version: 9B18 Kernel version: Darwin Kernel Version 9.1.0: Wed Oct 31 17:48:21 PDT 2007; root:xnu-1228.0.2~1/RELEASE_PPC Can anyone make any sense of this. Don't forget that this Powermac never had any problem's B4 Leopard and that it's been the most stable Mac i had. I'm so pissed off at me for making that switch. I spent at least 6 hours on the phone with apple in two different occasion and most of that time was waisted just waiting for someone to answer. Thank's in advance for any help or advices you could send my way. Missing my Tiger......... Yvon.