I Have IBM Sever which is having active directory windows 2008 installed. When I login to the server it restarts itself and some time it restarts just 5 or 10 minutes after logging.At first sight it seems to be a hardware problem but I took vhd file of server and installed it to the other hardware server but it keeps the same. I have scanned server thoroughly through microsoft forefront security and through malwarebyte byte but the issue is same. What could be the problem. Please suggest.