You may have a bad coil on the CRT the coil has 100v+ running through it and acts like an electro magnet to guide the electrons to the face of the picture tube if there is a area that is closed on the coil it will not pull the electrons to the bottom of the tube.
Epox 8rda6+
Mobile 2500 @ 2630 core 1.775
IQYHA 0348
Samsung 930B
500w Raidmax alum Power Supply
Windows XP pro sp2
1.5gig Corsair XMS 3200 Pro memory
Ati Radeon x800PE
Ati modded bios
Cannon 630U Scanner
HP Photosmart 7960
Linksys Wrt54g HPR WRT Thibor 15c firmware
Koolance EXOS Liquid cooling PC Ice 44c load
Seagate sata ST3160812AS Drive
2 -WD 80 GB Special Edition 7200 Drives
Blizzard Case baybus & blue cold cathode
APC 1000XS ups
Klipsch Promedia's
Xerox xl2120 laser copier/printer