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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Randomly on my laptop screen this appears and debian just freezes. Sometimes these vertical lines don't appear and system freezes anyway. Its just random. How do i identify if this is hardware or software issue? and then how to identify exact piece of hardware or software causing this problem.
RAM or Video card issue. Are you SURE the entire machine actually locks up, or just the display? Try ssh'ing into the machine when this happens to see if it's actually staying alive, though the display stops working.
yeah, entire machine locks up. Yeah have tried ssh'ing from mobile and it was stuck one time when i did that during a freeze. have replugged RAM let's see if system freezes again,
May just be bad RAM as well on a 12 year old machine. Should be cheapish to replace. Try running a memtest