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Single short beep at bootup, keyboard flashes, and no video

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May 12, 2009 11:03:37 PM

The system was originally bought at a swap meet type place. It has a ECS p4m800 pro-m v2.0 motherboard, with 1 GB (2x512) MB PC24200 RAM. IDE Harddrive, 160GB or so.

It also has a AGP Video Card.

I started troubleshooting by testing PSU with a tester, all lights tested good. I hooked up a ANTEC 400W PSU just in case, and still same result.

Next, I pulled out one stick of RAM, still same result with both sticks tested.

I then swapped video cards with another AGP Card and booted, still no luck.

Monitor is working as it is used on another machine just a few feet away. It never comes up with a boot screen or anything similar.

Processor is a Pentium D (I don't know the details unfortunately though)

I couldn't replace the motherboard with one of the same, so I purchased a ECS G31T-M motherboard. I put in processor, RAM, used on board video card. It still boots up with a single boot.

Since the new board is a socket 775, I tried a Socket 775 P4 Processor from a working machine. This also did not work.

I then made sure that neither of the USB header? cables were plugged in and still a single boot, keyboard lights up, and mouse has power to it (it's a laser).

I tried a different keyboard, tried to boot with out keyboard and mouse unplugged.

I also tried to boot with completely different ram Corsard DDR2533 and still same results.

I made sure that the case fan was also unplugged.

CPU fan I tried plugged in and also unplugged with same results.

What else can I try?
a b B Homebuilt system
May 13, 2009 12:40:02 AM

Did you remember the 4 pin cpu power? That's a very common mistake.
May 13, 2009 12:44:37 AM

Yep, I did have that plugged in, I am hoping it's something easy so any guess is better than where I'm at right now.
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May 13, 2009 2:27:51 AM

Yeah, I sort of found that part out, but it should take the Pentium D, although I don't know which model it actually is. My only guess is that it's the CPU, there's nothing else I haven't tried and I don't have a different CPU to try, I thought the P4 would work but turns out that is not compatible. I guess I could try the P4 in the old mobo, but i'm not even sure if that's compatible.
May 13, 2009 2:29:17 AM

Not that I figured it out, but I sort of figured that it was incompatible.
May 13, 2009 2:34:00 AM

I think I'm going to try to find a Pentium D or Core 2 Duo to test it, how often does a CPU fail? Can't be too often....
a b B Homebuilt system
May 13, 2009 3:44:53 AM

CPU's do fail, but not near as often as most of the other components, specially those with moving parts.
May 13, 2009 2:22:52 PM

If the CPU failed, would that ruin the mobo, or more likely if the motherboard failed could it ruin the CPU?
a b B Homebuilt system
May 13, 2009 2:32:23 PM

It's not likely that one would kill the other. They don't emit their own power. The PSU is the one that can take components down with it.
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