A few things to begin with:

- Remove the CMOS battery, and try to boot the computer. A dead battery can make the computer behave strangely, if it boots with the battery removed, there's the problem. It should be replaced after 13 years of storage in any case. If it's one of those boards with a RTC module with built in battery, you'll have to order a new one and replace it, or do a battery mod on the existing one.

- Remove and re-seat everything that you can. CPU, RAM, add-in cards, cables, BIOS module, etc. Do it a few times to wear down eventual oxide layers. 13 years in a damp basement will almost infallibly cause some oxidation to metal parts.

I second the suggestion to replace the battery. I have a socket 7 system that didn't go past the initial bios screen or even detect hard drives correctly with a dead battery. Replacing it fixed that.

I checked with new battery, with the Virge DX PCI and an atx psu from my celeron DOS build with no luck.

Maybe the cpus are dead, because I didn't stored them properly.

JSO wrote:

Maybe the cpus are dead, because I didn't stored them properly.

That's very unlikely.

Are you configuring the jumpers correctly for the new CPUs you're testing the board with?

CPU's don't die that easy...

Maybe time for a PC-Diagnostic card, i got one of those for less than 10 bugs on ebay.

I think that don't die that easily... But... You never know.

Yes I setting up correctly the jumper settings according to the manual.

Recently I bought from ebay for 30 euros another board with ram and cpu. It's the Asus P5SVM with a Pentium 100 installed and 64 MB RAM. I will test the cpus on this board. The bad thing is that it isn't for baby at case and I've already send the case for painting and I cleared the yellow color from the plastics.

Oh.. did you test the mainboard on another power supply?

And did you check the Elco's? Any leaking ones.

I've seen CPUs in very poor shape/stored pretty badly and none of them were dead. The only dead CPUs I've got are my fault (never insert a 486 the wrong way 🙁 ) ... okay maybe one Core 2 Duo that died mysteriously, but that's the only one I've got that died that way. I even have a cyrix CPU with a missing pin that works perfectly. The same can't be said to the motherboards unfortunately ... I've got a PCChips M912 that is in perfect shape but that doesn't give any sign of life at all, except that the CPU is heating up, but my POST card doesn't show any POST code. Some of my socket 7 are dead too for no reason. I managed to save only one socket 7 board (the ATC 5030). It's problem was that for some reasons the BIOS rom chip is completely toasted : Uniflash can't detect it at all. I also have got a socket 7 board that intermitently works half way and the other time doesn't work at all, and I can't figure out why 🙁.

I don't want to discourage you, but motherboards tend to fail way more often than CPUs do. Maybe you should check if the CPU is heating up. If you had a POST card, you could know if the CPU starts up or not. This helped me a lot with the ATC5030 because even though it's bios was dead, the CPU was starting up

Yes I've checked the motherboard with an ATX PSU.

The capacitors are fine.

I can't remember when I stored this board and replacing it with a Socket A and Athlon 2400+ XP was because of some kind of malfunction or issues.

When the new board with ram and cpu will arrive I will make again some tests and I will remove the eeprom chip to reseat it again.

Roman78 wrote:

CPU's don't die that easy...

Maybe time for a PC-Diagnostic card, i got one of those for less than 10 bugs on ebay.

Only 10 bugs for hundreds of bugs you can detect with it... Very nice investment, indeed 🤣

Both CPUS are ok, I tested them to another board. Asus P5S-VM flashed with latest custom bios.