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HP dc5800 Not POSTING

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  • Desktops
  • Hewlett Packard
  • Systems
  • Computers
Last response: in Systems
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October 16, 2014 5:32:05 PM

I'm struggling with this computer.

A customer brought in an HP dc5800 tower. I did a virus removal on it 3 months ago, and it was fine then.

Now, the system won't POST. The fans start to spin, but then stop. The process repeats indefinitely. I've tried 4 different sets of RAM- including the 4 sticks from my own desktop. This didn't do anything.

I then looked at the power supply. I tried two of them- including a 750W Corsair from my own desktop. This also didn't do anything.

Any ideas? Thanks for the help!

More about : dc5800 posting

October 17, 2014 12:16:28 AM

What about the CPU? Did you check the CPU cooler heatsink to see if it was full of crap and maybe cooked the CPU to death. Is the CPU fan even running? I'm sure you checked but it's a possibility and needs to at least be suggested. Which fans start to spin, all of them, or just the case fans, or just the CPU fan?

Any beep codes at all? Is there a system speaker installed so that there even would be beep codes?
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October 18, 2014 10:17:00 AM

He said that he was getting 4 beeps. I haven't herad any beep codes, myself, though.

I checked the CPU fan setup. The heatsink looks immaculate!

All fans will spin- there is the CPU fan (Not directly attached to the heatsink- HP has it in a plastic container right next to the heatsink). There is a rear 80MM? case fan that will spin, and there is one large fan in the PSU that will turn.

This one's got me stumped!
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October 18, 2014 12:10:07 PM

I would either test or replace the power supply. Don't replace it with a cheap one like what came with it. Pre-built systems almost always come with inferior units that barely meet spec. 4 beeps on that unit pertains to an overloaded power supply. That could be caused by something else overloading the PSU but 90% of the time it's just the PSU itself.

I'd recommend that you get at least a Tier 3 PSU for that unit. By spec that's a BTX form factor power supply, but I would need the model number of the power supply, which should be on it somewhere, to know for sure.

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