加拿大采购需求：有氧运动器材、空中自行车、商用跑步机、家用椭圆机、直立自行车、踏步机

I own a hi ultra assault bike and I'm having some issues with the screen. After changing the batteries, the screen still won't turn on, although I can hear beeping sounds. It seems like the bike is functioning to some extent, but I'm unable to see any information displayed on the screen. Could you please provide me with guidance on what might be causing this problem? Specifically, I'd like to know if there are any components that I may need to replace or troubleshoot to resolve this issue. Any insights or recommendations would be greatly appreciated, as I'm eager to get the bike back to full working order. Thank you!