Pentium III Slot 1 motherboard/PC (Sunniside NE16)

Clearing out cupboards and found my old Slot 1 Advent 3031 Desktop PC but it won't boot, i just get three long beeps. Looking for a working PC with similar specs to see what is stopping it from working.

I have tried a couple of AGP graphics cards but as a couple of capacitors look to be leaking I think the motherboard is dead.

I'm in Sunniside NE16 but happy to collect in 10 mile radius.

Ta for reading this far.

Nick