On 08/27/2014 06:07 PM, SilverTip257 wrote: > On Tue, Aug 26, 2014 at 10:54 PM, Reinhard Dunkel <dunkel at sciencesoft.net> > wrote: > >> I used CentOS 5 for years. Suddenly, it takes one second holding a >> keyboard key until it shows on the screen: >> >> > Is this system accessible via SSH? > Does the behavior only happen when using the physical keyboard? > > Might it be out of physical memory (RAM) and swapping violently? > Disk thrashing of this sort can cause rather irritating delays. > > Or maybe a failing or failed drive? (Assuming you could have a hardware or > software RAID setup) Does CentOS now only support user request tracking by email? I cannot find this thread on the CentOS web site... My computer has 4 GB Patriot memory - the maximum amount the motherboard allows. Using command "top" shows less than one percent of CPU and memory are in use. The computer is idle. I am using a 1 TB WD disk for CentOS 5 and a 2 TB Seagate disk for CentOS 7. No RAID. On CentOS 5, I use command "su" to show a root shell. On CentOS 7, su no longer works and I use "ssh root at localhost" instead. (I have not tried SSH to access my CentOS systems remotely yet.) Concerning a previous comment: I did not modify the hardware likely causing this problem. I only have to switch between both disks - described above - to boot CentOS 5 or CentOS 7. My suspicion is "yum update" using numerous official and unofficial "repos" installed something causing this challenge. The login screen of CentOS 5 for user name and password still works fine. By the way, we develop software (NMRanalyst) and I try to keep a CentOS 5 system alive so we can test on it to claim our software is supported on it. When I don't get further suggestions, I likely re-install another disk with CentOS 5 - this time using only official repos. ThanX for all suggestions!