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This could be a back-light problem, it can be caused by a faulty inverter board which supplies high voltage to the CCFL lamp or the CCFL lamp is faulty. The CCFL lamp is a mini fluro tube.
Check LCD Parts for service, parts, and DIY info - click on this link to their WEB site :- www.lcdparts.net
If you look on the back of the monitor it has the name of the manufacturer - which I googled and found this warranty information:
If you already know that your monitor is out of warranty but want to try to figure out what's wrong with it, these are the contact numbers:
California: PTI 7373 Hunt Avenue Garden Grove, Ca 92841 Phone: 714-799-3899 Fax: 714-379-6290 Hours: 8AM to 6PM Pacific Time Texas: PTI 10849 Kinghurst Suite # 120 Houston, TX 77099 (281) 530-4100 (281) 530-4104 fax Hours: 8AM to 6PM Central Time For further warranty information, please contact our Customer Service Department Call our toll-free service number at 1-800-776 8439 for out-of-warranty service rates.