Hello, I am new to STM32 and keil µvison5.I have a STM32F407VGT6 I wrote a code and it's build successfully . But when I try to load ,it says "NO ST-LINK detected "Cannot enter debug mode" and "Error:flash Download Failed-Target DLL has been canceled

[NSOLT.1]

I reinstalled everything from keil to the st-link utility. I reinstalled the driver en.stsw-link009 . But still the same problem. Also it's not detected by the st-link utility.

So, any solutions ?

[Tesla DeLorean]

And you have an ST-LINK or board with one on it?

Do you see it in Device Manager?

Try a different cable, USB charging cables that don't have data wires won't work.

[NSOLT.1]

Do you mean the jumpers? Yes they're there.

Well, it was under the "Universal Serial bus devices" but since I deleted it, I couldn't return it back even though I reinstalled the driver.

I will try to buy another cable tomorrow.

[NSOLT.1]

It's an usb 2.0 . So it transfer data isn't it ?

[NSOLT.1]

Also when I plug in the board, there's some LEDs that turn on, but the pc makes no sound

[Tesla DeLorean]

What board are we talking about? STM32F407G-DISCO or DISC1

What version of Windows?

Using a USB Hub or Docking Station?

DELL laptop? AV Software?

Corporate machine with limits on USB Mass Storage devices?

[NSOLT.1]

-How to know DISC0 or DISC1 ?

-Windows 10

-I am using the computer port

-Yes I am using Dell vostro 15.I don't have any AV software except windows defender

-I didn't understand your last question.

-And thank you for your time