I just bought a syncmaster t240 and the check signal cable appears in the screen when i turn my computer one, I tried
![Computer Motherboard Type-E to 20pin Adapter Mainboard PC Power Signal USB 3.1 3.0 Quick Speed PE Converter Braided Shielding Signal Cable | Walmart Canada Computer Motherboard Type-E to 20pin Adapter Mainboard PC Power Signal USB 3.1 3.0 Quick Speed PE Converter Braided Shielding Signal Cable | Walmart Canada](https://i5.walmartimages.com/asr/f7837df4-d44c-49cd-9633-2bab8e25a706.8d9e7b1bf0ee9eff34c55fbea4ae10a6.jpeg?odnHeight=450&odnWidth=450&odnBg=ffffff)
Computer Motherboard Type-E to 20pin Adapter Mainboard PC Power Signal USB 3.1 3.0 Quick Speed PE Converter Braided Shielding Signal Cable | Walmart Canada
![RS232 Cable Computer Cable Flexible Foil Briad Shielded Copper Core Control Signal Cable for Communication Electrical Cable Flat Cable Multi Pair - China Computer Cables, Control Cable | Made-in-China.com RS232 Cable Computer Cable Flexible Foil Briad Shielded Copper Core Control Signal Cable for Communication Electrical Cable Flat Cable Multi Pair - China Computer Cables, Control Cable | Made-in-China.com](https://image.made-in-china.com/2f0j00YWnhmoRqANGL/RS232-Cable-Computer-Cable-Flexible-Foil-Briad-Shielded-Copper-Core-Control-Signal-Cable-for-Communication-Electrical-Cable-Flat-Cable-Multi-Pair.jpg)
RS232 Cable Computer Cable Flexible Foil Briad Shielded Copper Core Control Signal Cable for Communication Electrical Cable Flat Cable Multi Pair - China Computer Cables, Control Cable | Made-in-China.com
![5 4vga cable computer signal cable 0.4 meters vga industrial computer case one piece machine vga line 40c|computer case tower|computer mini casecase sports - AliExpress 5 4vga cable computer signal cable 0.4 meters vga industrial computer case one piece machine vga line 40c|computer case tower|computer mini casecase sports - AliExpress](https://ae01.alicdn.com/kf/HTB1Ox6SHVXXXXcYXFXXq6xXFXXXK/5-4vga-cable-computer-signal-cable-0-4-meters-vga-industrial-computer-case-one-piece-machine.jpg_Q90.jpg_.webp)
5 4vga cable computer signal cable 0.4 meters vga industrial computer case one piece machine vga line 40c|computer case tower|computer mini casecase sports - AliExpress
![VGA Kabel Stecker auf MaleBraided Abschirmung Hohe Premium HDTV VGA computer tv display signal kabel 0,3 m/0,5 m/1,2 m/3m|vga cable|vga vga cablevga vga - AliExpress VGA Kabel Stecker auf MaleBraided Abschirmung Hohe Premium HDTV VGA computer tv display signal kabel 0,3 m/0,5 m/1,2 m/3m|vga cable|vga vga cablevga vga - AliExpress](https://ae01.alicdn.com/kf/HTB1Tk8bQXXXXXXRapXXq6xXFXXXp/VGA-Kabel-Stecker-auf-MaleBraided-Abschirmung-Hohe-Premium-HDTV-VGA-computer-tv-display-signal-kabel-0.jpg)
VGA Kabel Stecker auf MaleBraided Abschirmung Hohe Premium HDTV VGA computer tv display signal kabel 0,3 m/0,5 m/1,2 m/3m|vga cable|vga vga cablevga vga - AliExpress
![Amazon.com: 3.5mm RCA Component Video Cable YPbPr Male to 3 RCA Female RGB Adapter CBF Signal Cable AV : Electronics Amazon.com: 3.5mm RCA Component Video Cable YPbPr Male to 3 RCA Female RGB Adapter CBF Signal Cable AV : Electronics](https://m.media-amazon.com/images/I/41f7c0E75QL.jpg)