I have an AMD Asus RX580 card.
Suddenly small black pixels started to appear in the browser window.
The problem has become worse and now on any browser or game window appear with black pixels everywhere.
I tried changing the PCI slot, reinstalling the AMD driver but without success.
Windows 7 Professional 64-bit SP3
Intel Core i5 7400 @ 3.00GHz
Kaby Lake 14nm Technology
16.0GB Dual-Channel Unknown @ 1069MHz (15-15-15-36)
ASUSTeK COMPUTER INC. PRIME Z270-A (LGA1151)
DELL P190S (1280x1024@1Hz)
Intel VGA Standard (ASUStek Computer Inc)
ATI Radeon RX 580 Series (ASUStek Computer Inc)
931GB Western Digital WDC WD1002FAEX-00Y9A0 ATA Device (SATA )
No optical disk drives detected
Realtek High Definition Audio