Thanks for your time,
ok I have a Samsung SyncMaster 240T, it was working great.
Now when I boot up everything looks ok, but when Windows or OSX starts it beeps and keeps flashing in and out.
Now I cant get it to work for a little a bit at 800 x 600. but not long. It can't handle the high res settings any more, I had that thing at 1900 x 1600 at one point.
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Follow the instruction below to solve your problem: Restart your computer and enter Safe Mode (press F8 right as the computer starts booting up. Choose Safe Mode in the menu, press Enter twice).
While in Safe Mode, open Control Panel and go to Add/Remove Programs (Programs and Features on Vista/7) and uninstall the display driver software/drivers.
Restart your computer and boot normally. Now you should be able to see everything. Things might look bigger and uglier, that because there's no display driver installed. All you have to do now is reinstall the display driver. Use it's original disc or go to the manufacturer website and download the latest driver.
Your Back light inverter power board has died. The beeping and blinking are caused by the power board repeatedly trying to start up and failing.
This is a common failure point of LCD monitors after a few years of use. The heat build up in the monitor case causes parts called capacitors to
blow leading to the power supply short. If you can solder you should be
able to do the repair. Go to our web site at: www.ccl-la.com/badcaps.htm
We have pictures of what to look for. Now take the back off of your
monitor and replace all of the caps that look like the pictures and you
should be back going again. Be sure to use high temp parts, they will
be marked 105c. The values you will need to get will be marked on the
sides of the bad ones such as 220uf, 470uf or 1000uf. When you insert
the new ones be sure to put the polarity stripe going the same
direction as the old one comes out. If you have any questions just let
me know. If you don't want to do the repair yourself we do offer a
repair service for $30 + return shipping.
I hope this helps, if so please rate our solution.
Its possible that the cable from the laptop to the monitor is damaged. I would #1 make sure that the connection into the pc and into the monitor are both snug, if they are just slightly off it will keep the monitor from powering on. If they are snug, try another cable (if you have one) or hook the monitor to another pc (possibly your laptop, if it has a video out). Let me know if that solves the problem.
I too have the same problem with the same monitor.. tv looks great OSD looks great.. pc is dim.. This has nothing to do with the inverter board or the backlight.. I believe that there is an issue with the components that render the Computer video.
I ordered this: http://cgi.ebay.com/14V-AC-power-adapter-for-Samsung-SyncMaster-240T-LCD_W0QQitemZ260130887919QQihZ016QQcategoryZ86707QQrdZ1QQssPageNameZWD1VQQcmdZViewItem on eBay when my power adapter died, and it worked like a charm.