Monitor problem any advise welcome

It is possible that monitor doesn't accept your graphic adaptor's resolution/frequency.
Solution: Plug-in other monitor (possibly the one working recently) and change resolution/frequency to lower values (ex. 800x600 / 60Hz).

heres the spec if that helps i tried all that but no joy thanks for your help

Display Type Display / CRT
CRT Type Diamondtron U2 - aperture grille
Built-in Devices USB Hub
Width 49.3 cm
Depth 50 cm
Height 47.9 cm
Weight 29.5 kg
Display
Diagonal Size 22"
Dot Pitch / Pixel Pitch 0.24 mm
Max Resolution 2048 x 1536 / 88 Hz
Max Sync Rate (V x H) 200 Hz x 142 kHz
Video Bandwidth 390 MHz
Controls / Adjustments Brightness, contrast, H/V moire, H/V position, H/V size, gamma correction, rotation, trapezoid, convergence, degauss, colour temperature, parallelogram, pincushion, pin balance, zoom
Display Screen Coating ARAS screen treatment
Signal Input 2xVGA
Features Dual Beam Focus
Image
Image Colour Temperature Adjustable
Image Brightness 200 cd/m2
Video Input
Analogue video Signal RGB
Audio Output
Type Speaker(s) - integrated
Output Power / Channel 1 Watt
Expansion / Connectivity
Interfaces 2 x VGA - 15 pin HD D-Sub (HD-15)
1 x audio line-in - mini-phone stereo 3.5 mm
1 x USB upstream - 4 PIN USB Type B
4 x USB downstream - 4 PIN USB Type A
1 x headphones - mini-phone stereo 3.5 mm
Miscellaneous
Cables Included 1 x VGA cable
1 x audio cable
1 x USB cable
Compliant Standards FCC Class B certified, CE, TUV GS, DDC-2B, DHHS, EPA Energy Star, PTB, TCO '99, VESA DPMS, UL 60950, CSA 22.2 No. 60950
Power
Form Factor Internal
Voltage Required AC 120/230 V ( 50/60 Hz )
Power Consumption Operational 170 Watt
Power Consumption Stand by / Sleep 3 Watt
Manufacturer Warranty
Service & Support 3 years warranty
Service & Support Details Limited warranty - 3 years
Environmental Parameters
Min Operating Temperature 0 °C
Max Operating Temperature 35 °C
Humidity Range Operating 10 - 80%