LCD screen SDM-HS75P has a message on the center displayed all times.It says INFORMATION MODEL:SDM-HS75P SER.NO:1022769 MANUFACTURED:2005-18 and it stays on top of windows all time. How can I take this message of the screen/

If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts

try replacing the back light inside the monitor.

h_e_l_l_f_i_, Have you performed the flashlight test after the screen goes "BLANK" ?? No!! You will not find the "flashlight" test listed in the OWNERS manual!! The test is a quick evaluation of the STATE of the units "switch-mode-power-supply". Did you repair the power supply to get online to fixya? The more info you tell me about your LCD monitor the better I can assist you. Is the unit really "BLANK" or is it just "BLACK"?? Can you SEE the WIN-desktop when a bright "flashlight" is held 1" from the screen at different angles? If you can see a faint image being displayed it means the SMPS is in partial shutdown and still powering the VGA to LCD interface board. If unit is both BLACK and BLANK, then SMPS is likely in full shutdown mode! I will assume that when you stated "runs" for 5 minutes, that it would display normal text and graphics as usual and NOT be wearing a pair of NIKE's runners footwear? Yes! From your description it would lead me to think that your SONY has a SMPS/INVERTER problem. You failed to state the age and or approximate TOTAL "ON" hours the unit has. (hrs/day x 350days x Years since DOM). It makes a difference in whether I tell you to trade up to a wide screen or have it repaired(refurbished with new SMPS/INVERTER or just rehab the SMPS on your own. hellfi, surely, after reading this you WILL go to YOUTUBE, (just fyi) and view some of the longer video clips of "LCD monitor disassembly" and typical "LCD monitor repair"!! You WILL be impressed at how much you will learn about how "the black screen of death" is dealt with. If this response helps in any way, please rate it on fixya. 12fixlouie lmistyrel @ aim.com Get back to me if further assistance is required asap!!!

Press once the Input button. The menu appears. Press the Input button again and hold it. Now this is reduced to the problem of blocking the Input button (holding it with something). (Not very technical but then again neither is the restart when the computer blocks :D) Cheers

just release the menu button of the screen make sure it is not stuck.

That will happen if the menu button is pressed and held down. Verify that the menu button is not stucked.

Press once the Input button. The menu appears. Press the Input button again and hold it. Now this is reduced to the problem of blocking the Input button (holding it with something). (Not very technical but then again neither is the restart when the computer blocks :D) Cheers

Could be the power supply like you said and the most obvious things to check when its open is the small fuse on the power supply or any capacitors which are buldging which are faulty.
This is for lcd monitors which have a built in power supply or if you dont know they use the kettle type lead =].

I had the problem sometimes, but then I connected a second computer to the analog input and found out, that the screen didnt turn black but switches between the inputs on an on.

I found out that the "input" button seems to be short or damaged, as the behaviour was invertable by pressing the button. I blew into the button some times (a very naive solution, yeah) but it worked, the switching stoppped.