The HD in my G5 Duel 1.8 failed. I installed a new one and installed the OS from the original install CD's Went through the "Software update" process and noticed that iTunes (4.6) was not updated. Skype will not launch no matter what version I install. I have reset the PRAM, reformatted the HD and reinstalled all to the same result. Other app's are running normally IE: QuarkXPress, Photoshop, Adobe Acrobat, Illustrator. Network/internet connections are OK. I think Mail and Safari were updated to 1.3.11 (v622/624) & 1.3.2 (v312.6). I have attempted all of the ideas I can find on searches no change.