Fan revs and computer won't boot

February 8, 2009 at 12:04:26
Specs: Windows xp
We had a HUGE ice storm here in Kentucky and all our power went out for days. When the power returned, my computer had no power at all.

I replaced the power supply and the computer started and booted up fine. The next day I tried to start it but after 5 seconds, the fan would only rev fast and slow and the computer will not boot. I have unplugged and re-plugged all connections, blew out dust, checked memory and graphic card connections, etc. Nothing works. It can't get past the revving fan. I get to the screen with the HP logo and the option to ESC, F1 Setup, or F10 Recovery, however these keys do not work. I have an HP MediaCenter M1195c.


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#1
February 8, 2009 at 13:11:23
What power supply did you use as a replacement?

Verify that you have the voltage selector on the PSU set to 115V. Did the old PSU have a 20 pin or 24 pin power connector? Did you connect the 4 pin aux power connector to the motherboard? Is the wattage of the new PSU at least equal to the old one?


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#2
February 8, 2009 at 15:15:36
I replaced the power supply with exactly the same type of power supply I removed. It has a 24 pin power connector same as the old one. The voltage selector is set at 115V. And, the 4 pin connetor is connected to the motherboard. The wattage is the same as the old one also.

I started removing each memory card individually. The first one didn't make a difference so I replaced it and removed the second one. Then the computer worked. So not knowing if the card or slot was bad, I took that memory card and put it in another slot and the computer wouldn't work again. I thought then that the card was bad and removed it and was able to use the computer. But, the next day when I tried to reboot, the fans just started revving again.


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#3
February 10, 2009 at 10:03:02
I am so computer illiterate. Just really know how to follow instructions. Does anyone have any suggestions? I am at my wit's end.

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#4
February 10, 2009 at 10:36:38
Try stripping the computer down to the bard essentials. Remove any external drives, printers, usb devices, etc. Internally remove any add in cards, and all but 1 stick of memory. Then try to boot. If still no go then disconnect ALL the drive power and data cables. Pay attention to what went where and how. Try again.

Post the brand and model of the new and old power supplies.


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#5
February 10, 2009 at 16:04:24
I did as you said, OtheHill. I tried all different things. Unhooked everything, tried them all one at a time. Once it started to work without the harddrive plugged in, so tried to plug back in and it wouldn't work. Unplugged it and tried again, then it wouldn't work again. Nothing makes sense.

My power supply was a Bestec ATX300-12z Rev BD with 300 watt max. I replaced it with the identical model.

Thank you so much for your help. I really appreciate it.


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#6
February 10, 2009 at 16:27:35
I did as you said, OtheHill. I tried all different things. Unhooked everything, tried them all one at a time. Once it started to work without the harddrive plugged in, so tried to plug back in and it wouldn't work. Unplugged it and tried again, then it wouldn't work again. Nothing makes sense.

My power supply was a Bestec ATX300-12z Rev BD with 300 watt max. I replaced it with the identical model.

Thank you so much for your help. I really appreciate it.


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#7
February 10, 2009 at 16:31:03
Bestec is junk. Did you buy locally from a mom and pop shop or a big store? If a big store where you can return it I suggest you do so and get a better PSU. That is the first place to start. Did you also disconnect the CD drive? If not, disconnect it and then reconnect the hard drive. That might indicate the power supply is not up to the task.

How far along did the boot process go. You should be able to POST without any drives connected at all. All you need is processor, 1 stick of RAM, video, monitor and keyboard.

With that you should get video and at some point the boot will stop due to no valid boot disk.


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#8
February 10, 2009 at 18:39:43
I tried all you said, OtheHill. I ended up with the monitor, video, keyboard and 1 stick of memory. I got to the screen that said "Reboot and select proper boot drive or Insert boot media in selected boot device and press a key".

That is farther than I have been able to get to before. However, my fan is still revving. If I need to replace my power supply, (which I purchased from a store on Ebay) do you have any suggestions?

As I said before, I thank you so much for all your input.


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#9
February 10, 2009 at 20:39:22
Are you asking for a replacement recommendation? None of my recommendations would involve ebay.

I tried finding any specs on the PSU you have/had and detailed specs don't seem to be available. That is usually not a good sign.

I buy 95% of my computer hardware at newegg.com. The best etailer on the web.

Below is a link to a reputable PSU that does have good specs and has a rebate and free shipping. See if this is acceptable to you. Just click on the link to take you there.

http://www.newegg.com/Product/Produ...

Going back to your issues. The fan may be revving due to a BIOS setting or possibly you may need to remove the heatsink. Boot into the BIOS settings and look for PC Health. Monitor the system semps in there for a bit and post the numbers back here.

Could be the PSU fan making the noise too.


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#10
February 10, 2009 at 20:48:38
I can't get to the screen with the BIOS settings. As I said in my original post, I can only get to the screen with the HP logo and none of my keyboard keys work and I'm not able to get any further. The last things you had me do got me further than the logo screen.

I will check out the site you recommended. The reason I bought from EBAY in the first place was because I did a search for the same power supply that I took out of the computer. Possibly they will allow me to return it if it proves to be faulty.


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#11
February 10, 2009 at 20:54:47
If you are using a USB keyboard that might be the reason you can't get to the BIOS screens. If you have a PS/2 keyboard available try it. If you can get into the BIOS disable fast boot and any Logos (the HP screen is a Logo). That may allow you to see what is going on.

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#12
February 10, 2009 at 21:15:56
I have tried with both a USB and PS/2 keyboard. Neither allows me to go past the logo screen.

I am going to order a new power supply. Hopefully, that is what is at the root of the problem. I hate to thing I bought a dud, but if a new one helps then that would be a small price to pay.

Thank you once again.


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#13
February 11, 2009 at 07:40:52
The PSU I linked to is a good unit that could migrate to a different platform in the future. However, if you are thinking along those lines a PSU with more wattage still might be in order. The extra wattage is usually needed to power upper end graphics cards. If you are not into that then the unit I linked to will be sufficient.

As far as the damage done from the ice storm goes there is no way of knowing for sure. The damage generally follows the flow of electricity. PSU first, MBoard next, etc.

Do you have any recovery disks for the computer?

Watch the CPU fan when you try to start the computer. The fan must run.


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#14
February 11, 2009 at 09:21:32
I have checked out the power supply unit you recommended and I intend to order it. I don't have high-end graphics so this unit will suit my needs.

I do have recovery disks for the computer.

I have watched the CPU fan and it does run.


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#15
February 11, 2009 at 09:47:48
If the computer was turned on at the time of the storm the data on the hard drive may have been at least partially corrupted. That may not allow you to boot fully into WinXP. The restore disks may allow you to repair that.

First thing is to address the PSU issue.

There is ONE other thing I thought of that MIGHT help the situation.

A power surge that can damage the PSU can also possibly corrupt the CMOS. If you remove the coin shaped battery from the motherboard for a few minutes while the computer is unplugged the CMOS values will revert to the default settings. This might allow the computer to POST.

If that works you will need to enter the BIOS (setup) screens immediately to reset some of the values. Date and time will need resetting for sure. Possibly other settings for integrated hardware that you may or may not use and the boot order.


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