Imac 24" corrupts itunes, shuts down all of Adobe, crashes Chrome

Question

Hi at all,
just jump to the Problem:
After a Harddrive crash my imac 24" ((hard drive has been renewed since then twice) I Tried to restore everything by my time-machine backup (extern harddrive) and the migrations assistant while erasing the harddrive with zeros) shuts down my Adobe programms while starting them and they only function after up to 5 attempts.
iTunes gives me everytime a failure message for that the Library is damaged. iTunes opens then, yet there are hardly any songs in it and all of my playlists are gone. I can use an old library from my backup and it works for one or two runs, yet then when i restart iTunes everything is gone again. (so I can't sync my ipod and phone)
Even my Airport isn't working properly. I can't properly access my network (where my macbook is), so i have to reuse a wire for the internet.
And the 'least' bothering Problem is that my sites in Chrome are crashing or sometimes just a plug in at the site so i get a black square on the site which says that a plugin just crashed.
I even erased the Harddive yet again and bought Snow Leopard with the hope that it could help, yet even then iTunes gets a damaged library.
Thanks for all good thoughts.
Florian from Berlin

Answer 1

Sounds like there may be a problem with the electronics which support the hard drive or other hardware issue(s). 
My guess is that a hardware repair is going to be the next step.  I'm hoping for your sake that the issue is with the RAM, since that is relatively cheap to replace.  To check this out, I suggest "memtest" - here is the link:-
http://www.memtestosx.org/joomla/index.php
There may be ways to get this free, but I paid the princely sum of USD$1.39 for handling.
If you go this route, read up on how to run memtest in "single user mode".  To quote the user guide -
"Memtest is best run in OS X's single-user mode. In this mode, nearly all of the installed ram can be tested whereas under the full OS, a considerable portion of memory is tied up by OS X processes and the Quartz window manager. This is especially true in MacOS releases later than 10.3.5. Running memtest in single-user mode maximizes the effectiveness of the memory test."
Good luck!