Long term storage in anything other than an anti static bag means a very good chance of ESD damage that can render sensitive electronics useless.

If you unplug the machine for 30 seconds, then plug it in and try to turn it on, does the fan twitch? If it twitches for a moment, that would mean that the PSU is getting overloaded and automatically shutting off. Once that happens, it will stay off until you unplug it for several seconds.
If this happens, it means that something is shorted.

shamino wrote:

If you unplug the machine for 30 seconds, then plug it in and try to turn it on, does the fan twitch? If it twitches for a moment, that would mean that the PSU is getting overloaded and automatically shutting off. Once that happens, it will stay off until you unplug it for several seconds.
If this happens, it means that something is shorted.

It was mobo itself, I use my own PSU. But it won't turn on, is invisible ESD causing this? I don't understand

I mean does any of the fans move a tiny bit the first time you plug it in and try to turn it on? What I'm talking about would be a very short movement, just a tiny twitch.

shamino wrote:

I mean does any of the fans move a tiny bit the first time you plug it in and try to turn it on? What I'm talking about would be a very short movement, just a tiny twitch.

Yes... The fan move for a while and turn off

I have had stuff that sat out for years and salvage machines/parts that most would have never thought would work. When it comes to ESD it is all about the environment is stored, come a dust storm and everyone can feel the static in their hair even a anti static bag might not be enough.

Uuuuuh, the overrated ESD again...

Oxidated? Rat contaminated? Throw it out...

Some motherboards (yes even old Pentium ones) will not start if the battery is discharged. I suggest you measure the CR2032's voltage. If is below 2 volts, try a new one.
I remember having a ECS P5TX-Bpro 12 years ago, and it did NOT work if the battery was discharged.

fillosaurus wrote:

Some motherboards (yes even old Pentium ones) will not start if the battery is discharged. I suggest you measure the CR2032's voltage. If is below 2 volts, try a new one.
I remember having a ECS P5TX-Bpro 12 years ago, and it did NOT work if the battery was discharged.

I believe that mobo had discharged battery, I have to replace them soon. But if it still won't turn on how I can do? Plug them longer and put them properly when testing?

Trying a fresh battery is a good idea.

northernosprey02 wrote:

shamino wrote:

I mean does any of the fans move a tiny bit the first time you plug it in and try to turn it on? What I'm talking about would be a very short movement, just a tiny twitch.

Yes... The fan move for a while and turn off

How long? Less than a second?
Do you have to unplug it before the fans will move again?

If the fans barely move at all, and then you have to unplug it, then it probably means the power supply is sensing an overload and shutting off. This would mean something is shorted. If it's an ATX power supply, then you have to unplug it to make it reset before it will try to work again. AT might be different.

shamino wrote:

How long? Less than a second?
Do you have to unplug it before the fans will move again?

2 second the turn off.

I don't know, but my PSU (Thermaltake EVO_Blue 550W) had power switch. So I must switch off before the fan moved?

If it runs for 2 seconds that sounds like some other problem, probably not a short. If it was a short circuit it would only run for a very tiny moment.

It's normal that many ATX motherboards will run for about 2 seconds and then turn off until you use the switch on the motherboard. So it sounds like some problem with activating the motherboard switch. I don't know what it would be though.

Definitely try a fresh battery.

I had one motherboard that wouldn't switch on, and I forced it to run by soldering a wire underneath the motherboard that connected the green and black wires from the power supply. This defeats the motherboard switch and forces it to run constantly. That's a bad thing to do, but I was desperate so I did it anyway. It worked until 6 months later when the board wouldn't POST anymore.

I don't know, but my PSU (Thermaltake EVO_Blue 550W) had power switch. So I must switch off before the fan moved?

If the problem was that the power supply sensed an overload, it won't run again until it is unplugged for several seconds. If the PSU has a switch then that will do the same thing as unplugging it.
Unplugging will also remove standby voltage from the motherboard, so it might reset some of the motherboard's behavior also.

Resurrecting this thread

Just replacing the battery on P5TX-Apro and using IBM NetVista PSU to power on. The mobo can boot and work like a champ! Thank's for all!! I want to build DOS Time Machine with this mobo!

northernosprey02 wrote:

Resurrecting this thread

Just replacing the battery on P5TX-Apro and using IBM NetVista PSU to power on. The mobo can boot and work like a champ! Thank's for all!! I want to build DOS Time Machine with this mobo!

looks it took you 3 weeks replacing a battery. 🤣

noshutdown wrote:

looks it took you 3 weeks replacing a battery. 🤣

Haha! I don't have anytime to replacing battery actually, I take the battery from ASUS P2B-F which it still fresh. My DOS Machine Thread coming soon!