Try starting up from your system installation by inserting the disk and holding down the "C" key. If it starts up, go the second screen pull down menu to Utilities, Disk Utility and see if you cam repair the hard drive. Did you take any diagnostic tools such as TechTool Pro? Do you have a backup external firewire drive? Do you have a MacBook. I looked Tajikistan up and searched FedEx delivery and they don't provide service. Please tell me you didn't haul that huge iMac into one of the most remote parts of the world completely unprepared with your livelihood dependent on it.