blurred image & letters after format HD 7870

Hello all,
This is my first post.
I have an hd 7870 xt with an old LG M234D flatron screen.
I had not a problem since i format my pc. Now i see blurred image and thin letters.
I will paste my specs. any help?
thanks in advance




Graphics Card Manufacturer - Powered by AMD

Graphics Chipset - AMD Radeon HD 7800 Series

 

Horizontal Timing Total - 2200

Horizontal Timing Display - 1920

Horizontal Timing Front Porch - 88

Horizontal Timing Sync Width - 44

Vertical Timing Total - 1125

Vertical Timing Display - 1080

Vertical Timing Front Porch - 4

Vertical Timing Sync Width - 5

Horizontal Timing Polarity - Positive

Vertical Timing Polarity - Positive

Interlaced/Progressive - Progressive

G.Pixel Clock (KHz) - 148500

G.Refresh Rate (Hz) - 60

Current HDCP Status - Disabled

Current Link Settings - Not Available