I have old PC with ASUS P5P800-VM mobo, Pentium 4, AMI BIOS). For the previous week it did not start three times. First time there were two beeps and eventually moving monitor cable or switching off/on its power cable helped. Then there were problems with Windows startup - hanging its boot during or after. I several times pulled out cables to IDE HD. Then Startup recovery window helped, as once before despite there were message that it did not found the reason of issue but after reboot, system worked a pair of days. During this second issue Samsung 80 gb HD ultra dma crc error count increased from about one or several hundred to 700 then more of 1400. Calibration retry count -4. Pending sector - 1. After it I noticed in Asus probe -2.6 v that probably changed just for 2.8 v for 3.3 voltage that is far from norm. But system worked fine.
Then third issue happened. No boot just cpu fan spinned. No bios beeps, black screen. Without video card the same. Once, lately, pressing startup button for a minute without cord connected helped afew when I heard beeps afterwards. But next day no boot, no sound as before. I checked all psu voltages (green-black output connected for starup), then disassembled psu. And the situation stayed the same. It is notable that 3.3 v in psu are in norm as other ones. Despite 20-pin socket from psu is fried around 3 orange cables going to it. As well this mobo socket is fried where these 3.3 v orange reverse "pins" are inserted. I noticed this burning year ago, but after cleaning psu inside, 3.3 voltage that time restored ( probably not this time) and it worked despite this burning about a year. After "cleaning" psu this time I heard beep just first time but next time after connecting another hardware again just cpu fan spin, no beeps, no boot.
I have taken out cmos battery, cleared cmos on mobo (day before full non boot, without power cord disconnected, I put cmos clear to 2-3 pins position and system started for second or two but I quickly pulled out and I did not consider that something happened with mobo due to it). I also took out 4 ddr1 planes, without change. For that time I had objective to check my non working pc for another workable psu but supposing some bios problem I decided to change cmos battery (indeed it was 3v by checking with multimeter). I bought new battery, inserted it, without change, and after trying again when I left pc without battery for 10-15 minutes, probably with power cord connected, I tried to press power button. But even cpu fan did not start to spin. And nothing changed for three days.
I checked psu again, it works. And even shortened Startup and Reset pins on mb with buttons cables disconnected. Pulling cpu fan and changing thermal paste did not changes nothing today. I suppose that bios chip become deficient and need repair or probably motherboard electric supply, especially 3.3 v need repair, or whatever reason to think about? I have changed such mb two times but now there are a few such motherboards on secondary market and are rather expensive, unlike even 3 years ago when this mb was acquired.
Then third issue happened. No boot just cpu fan spinned. No bios beeps, black screen. Without video card the same. Once, lately, pressing startup button for a minute without cord connected helped afew when I heard beeps afterwards. But next day no boot, no sound as before. I checked all psu voltages (green-black output connected for starup), then disassembled psu. And the situation stayed the same. It is notable that 3.3 v in psu are in norm as other ones. Despite 20-pin socket from psu is fried around 3 orange cables going to it. As well this mobo socket is fried where these 3.3 v orange reverse "pins" are inserted. I noticed this burning year ago, but after cleaning psu inside, 3.3 voltage that time restored ( probably not this time) and it worked despite this burning about a year. After "cleaning" psu this time I heard beep just first time but next time after connecting another hardware again just cpu fan spin, no beeps, no boot.
I have taken out cmos battery, cleared cmos on mobo (day before full non boot, without power cord disconnected, I put cmos clear to 2-3 pins position and system started for second or two but I quickly pulled out and I did not consider that something happened with mobo due to it). I also took out 4 ddr1 planes, without change. For that time I had objective to check my non working pc for another workable psu but supposing some bios problem I decided to change cmos battery (indeed it was 3v by checking with multimeter). I bought new battery, inserted it, without change, and after trying again when I left pc without battery for 10-15 minutes, probably with power cord connected, I tried to press power button. But even cpu fan did not start to spin. And nothing changed for three days.
I checked psu again, it works. And even shortened Startup and Reset pins on mb with buttons cables disconnected. Pulling cpu fan and changing thermal paste did not changes nothing today. I suppose that bios chip become deficient and need repair or probably motherboard electric supply, especially 3.3 v need repair, or whatever reason to think about? I have changed such mb two times but now there are a few such motherboards on secondary market and are rather expensive, unlike even 3 years ago when this mb was acquired.
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