My samsung t220 turns on then goes black and beeps

The fluff filter may be
blocked.
Clean the fluff filter.
The vent ducting or the
ventilation outlet is
blocked.

Since it works for 2 hours it may not be cooling fan problem, neither RAM. Not at all the screen because it's okay after reboot. Most probably the Power circuit could be erratic.

Hello, take a look at this website and you can download the user guide which, if you read, will show you the controls.Hope this helps. Nicam49
http://www.samsung.com/uk/support/detail/supportPrdDetail.do?menu=SP01&prd_mdl_cd=LS22TWHSUV%2FEN&srchword=T220

m_r_murphy, The T220 may have developed an internal ac to dc "switch-mode-power-supply / CCFL inverter supply" power problem an you may need to need to have it repaired, Look into warranty or outside technician to refurbish the unit's SMPS/inverter!!! From your description, I believe that the SMPS is in "partial shutdown" mode!!! (no 12 to 14v dc) to power-up the "cold-cathode-fluorescent-lamps" that enable you to see the text and graphics that you already know are being displayed on your lcd panel!!! (+5vdc or 3.3vdc rail still alive!!!) You have "black screen" symptom!!! NOT BLANK n BLACK screen!!! There are lots of DIY videos on YOUTUBE to help you decide if you can attempt a cheap (<$20usd) repair to your unit. Do some reading in my old fixya profile (louie12fix) and visit some of the links you find there. Because your T220 isn't any different than any other brand of CCFL back-lit lcd display in it's basic design and operation you should be able to fix it. Get back to me lmistyrel on aim or do additional comment to this original post here on fixya with info on your next step to repair this unit.
All the other ccfl back-lit lcd monitor tech's on fixya already know what's wrong inside your unit!! Do your research first!! Bye for now, 12fixlouie

More likely to be bad caps (bulging top) in the power suppply, see example of failed SAMSUNG monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums

When the LCD monitor display flickers and or has a black screen then the fault is usually a faulty inverter or the CCFL lamp. When you look at the screen at a sharp angle and you see a dim image then it is a backlight problem and it is caused by a faulty inverter or a CCFL lamp.
Check out LCD Parts for parts, service, and DIY info. Use this link to their WEB site :-
www.lcdparts.net

change Video card.

Call them as these monitors have a 3-year warranty. No receipt? They will accept your word regarding your purchase. I have two that failed exactly the same way. I called 1-800-SAMSUNG and they gave me the choice of an exchange pair sent directly to my house (requiring a temporary credit card deposit) or by having the exchange pair sent to the UPS store where I would swap out my bad units. No receipt. They merely asked me when I purchased it so they could have it for their records. Manufacture dates such as your (March '06) and a purchase of September '06 are not far fetched at all.

That is perfectly normal - it is scanning the inputs to find ALL cables/device plugged into it. My New Samsung 2433 does the same thing.

check the voltage on the power connector going to the hard disk.
it should have 12volts in red and black wire and 5volts on the yellow and black wire.

the main problem the optical and hard disks can't be recognized is the low voltage supply the drives gets.