PC won't boot past the Thinkstation screen

[PotatoLover]

PC won't boot past the Thinkstation screen but fans are running and all. Tried replacing rams, checked the gfx card and all but no luck. No beeps as well. Tried removing all rams to check motherboard, and it beeps. Solution plz :\
P.S I don't know much about these things...

 

[cin19]

1) Unplug the power core from the power outlet.
2) Disconnect the hard drive and the GPU, and other device if you had, like external HDD, printer, etc. if your pc has the onboard iGPU then using it. * if the pc does not have the onboard iGPU, you may test the GPU in other PC to see it works or not.
3) only using one stick RAM.
4) Clear the CMOS by removing the battery, and wait for 5min. Put back the CMOS battery, and boot the PC.

Now either the PC will boot with the error: something like no boot device, or the PC will not boot.
1) If the PC boots, shut down and connect the hard drive. * You may reset the boot order. at least go into the BIOS to check it out. Check the computer manual if you don't know how to. And reboot the PC. After that you can add back other RAM. Keep in mind you need to shut down the PC before you add other part.
2) If the PC does not boot. Unplug the power core, clear the CMOS, try other RAM ( even try difference memory slot). And try boot the PC.
3) If that still doe not work out, may go to local PC shop ask for help.