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The symptoms you have are very common on this model. The capacitors in the power supply are beginning to fail and as this happens they can not filter the power correctly and you get the flickering until the unit stabilizes. As time go by the issue will get worse until the unit fully dies. The repair is very easy, you will just need to replace 6 capacitors on the power supply board. Here is a link to additional information on repairing this model.
A pink or red tint indicated that florescent back light bulbs that light up the monitor are going out. When they start to die they out out red or pink light instead of white light like they should. They bulbs are replaceable but not easy for someone not familiar with this type of repair. Parts would run about $30 plus shipping and are available online but it may not be worth the repair on the monitor due to age.
You can verify that it is the inverter going out by turning the monitor on in a dark room and shining a light directly into the screen. If you cannot see anything, then something has happened to the power circuit. Perhaps the solder on the power port has gone bad, and needs to be redone, or part of the circuit board fried. The only way to figure this out is to open it up and take a look-see. If you don't wish to try this, you can always take it to a shop and have them look at it. Be careful opening it, the inverter is high voltage. Don't have any power going to the monitor if you do this.
The flickering is most likely the florescent backlight having a hard time starting, Just like in a light fixture, as it gets old, it takes longer to warm up to get full functionality.
If under warranty, contact Dell for a replacement, if not, then when it becomes untenable, replace the monitor. Prices are dropping drastically, an new 20 or 22 In can be bought for about $150 or less
if its a CRT monitor then you wont have a problem, the all get decrepid and loose color flicker then eventualy die.
i say use it till it dies then get a new one or get a new one befor it dose damage to your eyes, a nice TFT screen will do.
Flickering on the screen can be caused by defective hardware in the computer or by improperly installed software, but it can also be caused by interference from external devices. The following examples describe situations in which your screen could start flickering:
Screen starts flickering because of interference caused by devices which generate magnetic fields, for instance:
a TV set
a laser printer
hidden power lines
Apart from interference, an incorrect setting in your system CMOS setup can also cause flickering. On some systems it is possible to distinguish between interlaced and non-interlaced monitors. The setup of your system should always be colour non-interlaced.
Proximity to the monitor of fans, air-conditioning units or other devices with rotating motors.
The number of devices using power from the same electrical line. Are you overloading the plug?
Monitor placed on an unstable surface.
Improper video drivers, this is a software problem, see section B
An improperly configured or a defective video card.