I am having the same problem on my 4 year old Sony e-200. I start the comp, and after about 30-45 mins. , the screen slowly goes black! sometimes it comes back after a few mins. and sometime I have to turn off the monitor for a few seconds and everthing is fine. Then it repeats after maybe 20 mins. or 5 hours later?
Screen is beautiful as always, when it is lite-up!
Any help?? CRT 17 in. Sony E-200 4-5 years old!
Thanks , Michael