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Hello, I have a HP EliteDesk 705 G1 Desktop and recently I had left the computer on over night and came to find the computer fan was running full blast. I cut the computer off and when I tried to reboot, the first time it was able to get to the screen saying there is a problem with windows and attempting to repair. Then the computer screen went black and fan started running full blast again. I tried this multiple times until the computer wouldn’t even show a boot screen, the fan would just start running full blast. Opened everything up, reseated the memory with no luck. Waited a couple of days and the computer started up again to the windows repair screen and then went black again and fan began running full blast and then back to black screen and fan running full blast again. I think it’s probably the motherboard but also wondering about the power supply. Any help would be appreciated. Thanks!
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Welcome to PCHF jedi_jackson,
Overheating and/or a flaky PSU can cause the symptoms that you describe.
Couple of questions if I may;
Was the computer still showing the Windows desktop or was the screen black.Originally posted by jedi_jackson
There are three versions of the model of PC that you have, Desktop Mini, Small Form Factor or Microtower.
Is there an add on video card present. -
It was on a black screen when I first found it with the fans funning full speed. I have the Small Form Factor model. Lastly, no add on video card.Comment
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It has a 6 pin power supply. I bridged the green wire from one of the connectors to a black wire on the other connector and plugged in the power and the power supply turned on.Comment
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Check the heatsink and CPU cooling fan to make sure that the fins on the heatsink are not clogged with dust and that the HS is mounted squarely/securely atop of the CPU.
The test that you have done means nothing I`m afraid as you know that the PSU was activating as the PC is starting up and what the test cannot do is tell you what voltage is coming from the PSU and if the voltage is both correct and stable.
What happens if you restart the computer, access the BIOS and leave it sitting at the BIOS screen, if not tried already give it a go.Comment
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Heatsink and CPU fans are both clean and securely mounted. If I leave the computer for a day or so and restart I can get to either the BIOS or Windows repair screen. If I go to the Windows repair screen it will eventually, before repairing or booting to Windows, go to a black screen and the fans go full blast. Then if I repeatedly try to reboot the computer it will not even display the HP startup screen that comes up before Windows starts or even to be able to access the BIOS screen. It has been sitting for a few days so I was able to get it to reboot and I currently have it on the BIOS screen.Comment
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Leave the PC sitting in the BIOS for a while to see if anything happens, the PC turning off etc.
Once the PC has been left in the BIOS for an hour or so post back and let us know, when you do post back can you also let us know if the cooling fan stays spinning as it should or if it ramps up to full speed at all, if the latter, feel free to turn off the PC and get back to us.Comment
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Went back to check the PC and it was at a black screen, really I guess no input to the monitor. Fans were both running full speed. Cooling fan was pushing tons of air. I turned off the PC and attempted a reboot. I heard the hard drive spin up, but screen stayed black. After about 1-2 minutes both fans began running full speed again. I should also note that the power button light is on and the light beside of it will light up when you press the power button, but it will not power down the PC. You have to manually unplug the power cord to get it to power down. It will power up using the power button though.Comment
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Just for clarity, so you left the PC sat in the BIOS and came back to a black screen and the cooling fans going full speed, if yes, definitely a hardware issue and the first thing to try would be another PSU.Comment
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Yes that is correct.Originally posted by phillpower2Comment
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Definitely hardware then as being pre-boot there is no software involvement, do you happen to have a fan like the one here if yes, you could try directing it so that the cool clean air gets drawn into the insides of the case to see if it helps any.Comment
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I do and I will give it a try but I will say that I have had the cover off the case while this is happening and the room stays approx 62 degrees F, so it should be cool, but I will try it. I will probably get a new PSU. I just hope it’s not the motherboard instead.Comment
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I would ask a local tech or tech store what they would charge for testing your PC, is your model of HP EliteDesk 705 G1 the one that has a power supply the same as a notebook or does it have a non propriety ATX type, either way they are not an easy replacement I`m adraid.Comment
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It is not like a notebook power supply. I suppose it’s an ATX type. I have some other power supplies that I could try but unfortunately they are all 24 pin.Comment
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So have you checked and found that the ATX mainboard connector is not the standard 20 or 24 pin type.Originally posted by jedi_jacksonComment
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