i have pentium three and i left it about a month but now when i try to switch it on, it can turn on but no display on my monitor what the problems and the solution even though the vga are all work well.

How are you certain that the vga output is working if you can't see anything?

Can you see the bios post? Can you hear a bios post?

If not, do you have an onboard gpu or dedicated gpu?

If onboard, have you checked your ram?

If dedicated, have you tried swapping it with a working one?

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.