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486 re-build

I'm trying to rebuild a 486DX4/100. It was working in it's old case, but the power supply fan had stopped, plus the case was huge & ugly. The power supply looked like a big job to swap over, as it is soldered to the switches etc... (I have another 486 for parts) so I decided to carefully put the working one into the other case with the functional (and newer) power supply.
All seemed to go well untill I booted up, ... the drives spin up but that's all. Nothing ! not even 'post' or any beeps.
I've re-checked the ribbon cables, tried other cables, re-checked plug/socket connection .... what have I missed
It is a 'no name' motherboard with an Intel DX40DPR100 (overdrive) CPU, & ALi M1487B1 & M1489A1 chips. 16MB frontpage ram (I've got 128 I could put in, but not sure if motherboard will take it) 4 PCI slots (one with the video card) and two Hard drives.
All is as it was when it was working in the old case, apart from the power supply (old one was 150 watt/ new one 200 watt)
any ideas out there ?

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486 re-build

In reply to: 486 re-build

Can you confirm that all the voltages from the "new" PS is ok?

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Check again

In reply to: 486 re-build

Make sure *all* the mtrbd. mounting posts aren't shorting out somewhere as no two mtrbds. mounting are alike. You may have to relocate or remove certain mounts so its properly set. The sad point is you need to inspect and that may require to dismount the mtrbd. you can't take it for granted. also, truly verify all cabling is propely located and ordinated. At least make a minium system in order to try to boot w/o all devices. Start there...

good luck -----Willy Happy

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Start over

In reply to: Check again

Maybe fastest way to find trouble.I would start with just the MB with HS CPU and RAM with speaker and power supply
attached laid on a piece of cardboard.Check for proper
beeps and if ok continue from there to add components.Only when all ok would I install to case and then check same way as parts added.

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