Check for EMI (Electromagnetic interference)
- Take a look to see if there is any power cables tangled with your VGA cable.
- Move the location of the CRT on your desk. I have seen large power trunks of wire in walls that power the house / apartment that "bleed" all over the CRT's that result in warping the signal and making the screen fuzzy.
If I were to have the SCRN @ my house:
1) Try 72 or 75 HZ vs. 60HZ on the refresh.
2) OSD options - Degauss to demagnetizes the screen.
3) Look to see if there is a pin bent on the VGA cable.
4) Look for VGA cable damage
5) After that I would open the case and look to see if if there was a focus POT inside the unit on the circuit board. Most of the time there is a brightness, contrast, and focus PCB mounted trimmer potentiometers, or "trimpots", intended for infrequent adjustment. Once found adjust with jeweler screwdriver.
** If you have never worked with TV's or CRT's know that there is 30,000 volts of electricity inside the tube that can discharge through your body that might result in death.
You might want to look for a LCD
http://www.pricewatch.com/monitors/
Gateway EV700
CRT - 17 inches diagonal (15.7 inches viewable), anti-reflective/anti-glare, 90? deflection, 0.28 mm dot pitch
Maximum resolution - 1280 ? 1024 non-interlaced
Display colors - Unlimited
Video bandwidth - 100 MHz
Synchronization - Horizontal, 30-69 KHz
Vertical, 50-120 Hz
Power input - 100-240 VAC
Certifications - UL, CUL, DHHS, and FCC Class B