is the motherboard blown up?

[Ted1]

I have a little pentium 166MMX which hasnt really worked well over the last 2 years (loads of weird errors), now it doesnt start at all , the power leds and HD leds fire up (also CD) but the screen stays black and it doesnt beep at the expected time , it just stays there... so whats wrong ? Is the motherboard gone or the cpu or what... it also happened the same thing to another PentiumIII I have (had)

I just now im getting mental with these 2 computers (Ive tried swapping & removing everything)

 

[Klosters]

Dunno about the P166MMX. I do know that my P3 550 FC-PGA died, causing the same problems you detail.