Hi there guys. I should firstly congratulate you for this great forum . It's like a heaven to me! I have been having this problem lately and i'm having a really hard time resolving it. Let me start with the details. I have a samsung tv-monitor model: lt24d590. The problem is that when i use it as a monitor (not tv) i get random restarts. PC works great but monitor goes black, as if i disconnected the power cord, and then boots up again working just fine. I had the monitor repaired from official samsung service center and they replaced the main pcb. They told me thought, the monitor worked perfectly before pcb replacement. So i guess it is my pc's fault. Could be the graphics card or the psu? my pc is extremely cleaned and maintained carefully every few months with excellent temperatures. Furthermore, i stressed my pc using prime95 and furmark but no monitor restart occured. Please help me here as i'm driving myself crazy. Let me know if any additional info will help you and i'll give it to you. Thank you in advance!!