HELP Navigating Menus No Mouse?

Running Windows 7 PC

Just downloaded & installed both Steam and Black Mesa & my kid & I have NO idea of how to even navigate the Black Mesa submenu system.

No mouse but arrow keys & [ENTER] work in Main Menu, (below)
Resume Game
New Game
Load Game
Save Game
Achievements
Options
Quit

Once in any submenu, (specifically Load Game), still no mouse or cursor seen & unable to navigate by tabbing or arrow keys in sub menus, we’re totally at a loss.

Are these menus supposed to be navigatable with PC mouse & if not then how? Do I need to somehow enable the mouse within Steam or the Black Mesa game?

At PC gaming I’m pretty rusty, (original Half Life PC version was the last PC game I played years ago). Completely lost here, any information much appreciated!

The mouse should work normally. Try to run a different game trough steam, if it works there then just reinstall black mesa.

It’s also possible that it’s a setting in Windows. Check the display and mouse settings in Windows. It seems that this can be a problem in games that run through Steam; it’s not really a Black Mesa issue.

Thank you for your input. Do you know which specific settings or mouse properties tab I should be looking at?

TIA!

[OFF TOPIC]
Sorry for this extremely dumb post, but…
HOW THE F*%C DO I CREATE A NEW THREAD IN THIS FORUM???!!

Uh…maybe push the NEW THREAD button???

In his defense, the button is bright orange, so it sort of blends into the black background. It’s easy to miss.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.