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Acer PC, No Screen, No Beeps, Just fans...


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#1 Toodle

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Posted 31 August 2014 - 06:51 AM

I have an Acer AM5100-U5301A Desktop. It is mostly the standard PC I bought a few years back. I have replaced the power supply a while back and replaced a hard drive that went bad. It was working fine... now it is not. 

It would not do anything when... no Power Supply fan or anything. I shorted the power supply on the 24 pin connector and it ran. Hooked it back to the motherboard and nothing. I bypassed the on switch on the computer panel and got the motherboard fans and all working. Still no hard drive or screen. The odd thing is it would work once. I would turn it off at the power supply switch behind the PC. And it would not come back on. I could separate the wires where I bypassed the front switch and reconnect them and it would work for one time... then it would not until I did this again. Sometimes the fans would start up for a second and then stop... and I would undo these wires and put them back and then the fans would run fine until I turned it off again. This is probably just something unique to bypassing the power switch. So back to the main problem. 

I could not get any beeps and the hard drive would not boot... no screen display. I took out the only PCI card which was a modem and removed the memory thinking I would get the motherboard to at least respond with a beep to let me know the memory was missing. Nothing. 

I am expecting the motherboard is shot, but before I gave up I thought I would post. I would love to know other troubleshooting steps and any info on cost to replace. I may just take the drive and put it in an external enclosure and put it on my router for access by the rest of the PCs since we don't use this one that much anyway, but if I can get it fixed cheap, I would give it a whirl. 

Thanks



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#2 ElfBane

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Posted 31 August 2014 - 07:32 AM

I would try another PSU. Since you seem to have other PCs this would be no-cost. If that doesn't fix the problem then you will have to "breadboard" your MB. See post #4 of this thread ... http://www.bleepingcomputer.com/forums/t/545295/serious-hardware-issue/?hl=%2Bbreadboard#entry3455482 .

 

Hope this helps



#3 zingo156

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Posted 02 September 2014 - 01:23 PM

Make sure you have the computer unplugged from power while removing or moving any hardware...

 

Try 1 stick of ram in 1 slot at a time (remove all other ram sticks). Move it to the next slot until you have tried that stick in all slots by itself. If you still have no post, try a different stick of ram in each slot by itself. If you have issues with the stick in 1 particular slot (a no post for example) the slot may be bad. It is also possible you have a bad stick of ram instead of the slot being bad, in this case the ram stick should cause the same problem all slots.

 

If you never get a stable system with just 1 stick of ram in 1 slot (trying all sticks by themselves) try removing all non essential hardware to get into bios:

 

Disconnect pci cards, pci-e cards - except a video card unless you have onboard in which case use the onboard video and pull the video card, hard drives, dvd drives, disconnect all usb headers as well. You should only have the power supply, main board, 1 stick of ram in 1 slot, the cpu and cpu cooler connected. You can also plug in a monitor and keyboard. Now try to power on the machine. If at this point you have no post screen or video etc, unplug the computer and pull the stick of ram, power back on and listen for a post fault beep code, you will need to hook up a motherboard speaker to hear any post fault code.

 

If you get no response next: remove all of the components from the computer case and connect only non essential hardware outside of the case, place the motherboard on a non conductive surface, a wooden table will do fine. Then try to power on again, you can short the power button pins on the motherboard, don't worry this is exactly what the power button does. Just touch a metal item to both power button pins to try to power the mainboard when outside of the computer case.

 

While you have the computer apart, look for blown or bulging capacitors on the mainboard and video cards etc examples: https://www.google.com/search?q=bulging+or+blown+capacitors+motherboard&noj=1&source=lnms&tbm=isch&sa=X&ei=Iz_YU6aDLsS2yASnjoKwAQ&ved=0CAgQ_AUoAQ&biw=1031&bih=603 please report any caps you suspect may be bad, you can take a picture and post here if you are unsure.


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