Get a Diagnostic Tester POST Card and check how far things get

The motherboard was sold as tested/working.

The CPU was sold as "Worked when I last used it but put in storage for an unknown amount of time"

So I suspect the CPU ?

model /rand of the motherboard?
model of the CPU?
replaced the CMOS battery?
All the other components are known good and work in another system?

is the cpu compatible with the motherboard ?

Chaintech 6BTM motherboard here: https://www.ebay.co.uk/itm/254594779337
Intel PII 350MHZ here: https://www.ebay.co.uk/itm/324006550148

PSU,Video and Memory used yesterday on a Socket 7 system, booting fine.

austinham wrote on 2020-05-22, 14:29:

is the cpu compatible with the motherboard ?

I assume so ? its not a Coppermine and as far as I am aware those are the only CPUs that may have issues on this board.

The thing I think that tells me something is really really wrong is the fan plugged into the case fan header does not spin up, however the CPU and PSU fan do ?

red-ray wrote on 2020-05-22, 14:05:

Get a Diagnostic Tester POST Card and check how far things get

Cant really wait on getting something like that from China due to any returns/refunds needed for ether the CPU or Mobo, normal China post takes a month at the best of times and these are not the best of times.

replaced the CMOS battery?

I see it came with one, you can be sure that is dead or dying (low voltage in-circuit) and can cause symptoms like this.

Any beep codes?

Another idea: Try changing JP8 (Power Failure Recovery) to 2-3 and try turning the PC on using the PSU switch.

evasive wrote on 2020-05-22, 14:59:

replaced the CMOS battery?

I see it came with one, you can be sure that is dead or dying (low voltage in-circuit) and can cause symptoms like this.

Replaced it with a known good one from another motherboard(i.e it was keeping settings with no AC fine) and still nothing.

Doornkaat wrote on 2020-05-22, 15:20:

Another idea: Try changing JP8 (Power Failure Recovery) to 2-3 and try turning the PC on using the PSU switch.

This did not work ether, also I double checked the PC100 RAM in a Socket 7 system and it is fine.

So pretty much the only thing I have not tried is another CPU because I simply do not have another Slot 1 CPU here.

cmos battery and jumper?

austinham wrote on 2020-05-22, 15:45:

cmos battery and jumper?

Tried a different CMOS battery, checked all jumpers are correct.

I have I think done everything I can do and no luck, so given what I have said would my prime suspect be indeed the CPU ?

removed the CPU and see if you get any beeps. My money is on a bad board however.

austinham wrote on 2020-05-22, 16:21:

removed the CPU and see if you get any beeps. My money is on a bad board however.

i dont have a PC speaker also the board was tested before shipping and the CPU was not so I am not sure.

Don't you have a case from which you can borrow the PC speaker for a test? Trying to diagnose a motherboard/CPU problem without a speaker or POST card is an exercise in frustration...

I have no source for a PC speaker at all no.