So to start off its an oldy motherboard (Asus M5a99X EVO R2.0) but its always been working fine for a pc thats almost never on anymore. Anyways since of today it started not booting up anymore so ive checked inside the case and saw it was still getting power so i started to mess around with it to see what the issue was
Changed outlet: No Boot
Changed front panel/power on button: No Boot
Removed 1 stick of ram: No boot
Removed the other stick of ram when puttin back in the other one: No Boot
Inserted a new CMOS battery: No Boot
Jumped the CLRTC pins: No Boot
But then i noticed that this hole time the ''bios_flbk'' LED was blinking so i thought well maybe thats the issue so i made a USB stick with the correct bios and stuck it in but after waiting for around 30min it was still blinking and not doing much else. But then comes the weird part i powered off the PSU and waited for all the lights to go off on the motherboard, switched it back on and then pressed the power button BEFORE it started blinking with the ''bios_flbk'' and it booted up just fine. It didn indicate that i had to resume to bios install which i did and everything was working fine afterwards. However when i shut down the PC and wanna boot it up again the same issue comes up with the ''bios_flbk'' blinking and the pc not booting.
At this point im not even sure wether its the motherboard or the PSU or anything else so what could be the issue here?
Changed outlet: No Boot
Changed front panel/power on button: No Boot
Removed 1 stick of ram: No boot
Removed the other stick of ram when puttin back in the other one: No Boot
Inserted a new CMOS battery: No Boot
Jumped the CLRTC pins: No Boot
But then i noticed that this hole time the ''bios_flbk'' LED was blinking so i thought well maybe thats the issue so i made a USB stick with the correct bios and stuck it in but after waiting for around 30min it was still blinking and not doing much else. But then comes the weird part i powered off the PSU and waited for all the lights to go off on the motherboard, switched it back on and then pressed the power button BEFORE it started blinking with the ''bios_flbk'' and it booted up just fine. It didn indicate that i had to resume to bios install which i did and everything was working fine afterwards. However when i shut down the PC and wanna boot it up again the same issue comes up with the ''bios_flbk'' blinking and the pc not booting.
At this point im not even sure wether its the motherboard or the PSU or anything else so what could be the issue here?