PC - No Display or USB power however fans are on

mitchb

Evening

My sons PC has stopped working, its about 16months old.

It still appears to power up, with the RGB fans lighting up but the display doesn't come on and there's no power from the rear or front USB's.

Had a look online and a few suggestions to try include removing the cmos battery for a bit and removing components and booting up each time to see if that makes a difference which ive tire with no luck.

Noticed when i was moving it that the 3 pin power cable felt a bit loose when connected at the back and even a slight nudge in one direction would cause the power to cut off. There was also some crackling when it moved.

So bought a new PSU from amazon,which came tonight fitted it and it was still dead, decided to run through the checks again while the new PSU was connected, starting with RAM and after moving it from one slot to the other it came back to life.

Kept the new PSU in as didn't like the other one being loose and crackling.

However  He had left the pc on working as normal, its went to sleep due to inactivity and we are back to the original issue when he has tried to wake it. 

Kind of out of ideas now, any suggestions welcomed

debitcardmayhem

No idea but PC doesn't tell anybody anything really, make model would help and what was the new PSU . Information actually makes it easier for folks here to help, much like saying my red car won't start.

Mr.Generous

remove the ram chip and boot up (It wont) then switch off, replace the chip and it should work. If it does it indicates a memory or BIOS fault.

mitchb

debitcardmayhem said:

No idea but PC doesn't tell anybody anything really, make model would help and what was the new PSU . Information actually makes it easier for folks here to help, much like saying my red car won't start.

Thanks, Here is the Spec

Custom build by palicomp

CIT Flash RGB Case

AMD RYZEN 5 4650G - 3.7Ghz/4.2Ghz Turbo - 6 Core/12 Thread + Radeon Graphics

K/FAN For CPU Included

ASUS Prime A520M-K A520 Chipset - USB 3.2 - M.2 1

16GB DDR4 2666Mhz - ADATA - 1 stick, 2 slots

500W PSU ( inpower braneded)

CRUCIAL 500GB M.2 NVME

Added a ASUS NVIDIA GeForce GTX 1050 PH-GTX1050TI-4G 4 GB about 8 months ago. 

New PSU added to try and resolve was a Evga 600 W1, 80+ White 600W, Power Supply which we have kept in and replaced the 500w one with

mitchb

Mr.Generous said:

remove the ram chip and boot up (It wont) then switch off, replace the chip and it should work. If it does it indicates a memory or BIOS fault.

Thanks tried that this morning, unfortunately hasnt worked on this occasion. Think my next step is to buy some new RAM to try. 

getmore4less

Any beeping noises?

Got any other pc you can try the memory in

GDB2222

Terribly daft question, but have you tried a different power lead?

mitchb

getmore4less said:

Any beeping noises?

Got any other pc you can try the memory in

No beeping noises and no other desktops to try the memory inGDB2222 said:

Terribly daft question, but have you tried a different power lead?

No questions daft believe me, often its the easiest and simplest things - which maybe the case here - see below, however yes we had tried another power lead.


So RAM arrived yesterday, fitted it and still the same issue.

Tried removing each component one at a time right down to nothing plugged in. Still the same.

After putting it all back together found a post on line that said to remove the battery and short the CMOS for 1 minute, tried that and it sprung back to life again.

Now the last time it came back to life I hadn't done anything other than remove the battery the night previous but had reinserted  and tried to boot with no joy several times after it.

Anyway fitted a new battery and so far so good for the last 24 hours or so.

Surprised as thought the device would still have booted etc with a bad CMOS battery but i guess that maybe its way of telling you it needs replaced.

Neil_Jones

All a CMOS battery does is provide just enough charge to power the board to hold the BIOS settings and the date/time (when AC power isn't connected).  It doesn't do anything else.

If the voltage in the battery drops to a point where it can't hold its charge, it may confuse the board and get itself into a hybrid/invalid configuration.  But as a general rule if the machine is left plugged in all the time the battery won't be used, but  all batteries naturally degrade/lose their charge in any event (about five years is the average life time for a CMOS battery - even though you say the computer is only 16 months old it'll be many months older having sat in a warehouse somewhere).

GDB2222

mitchb said:

getmore4less said:

Any beeping noises?

Got any other pc you can try the memory in

No beeping noises and no other desktops to try the memory inGDB2222 said:

Terribly daft question, but have you tried a different power lead?

No questions daft believe me, often its the easiest and simplest things - which maybe the case here - see below, however yes we had tried another power lead.


So RAM arrived yesterday, fitted it and still the same issue.

Tried removing each component one at a time right down to nothing plugged in. Still the same.

After putting it all back together found a post on line that said to remove the battery and short the CMOS for 1 minute, tried that and it sprung back to life again.

Now the last time it came back to life I hadn't done anything other than remove the battery the night previous but had reinserted  and tried to boot with no joy several times after it.

Anyway fitted a new battery and so far so good for the last 24 hours or so.

Surprised as thought the device would still have booted etc with a bad CMOS battery but i guess that maybe its way of telling you it needs replaced.

Yes, new CMOS battery is one of the first things I try, mainly as they are usually CR2032, and I have those lying around. Same with mains leads.  After that, diagnosis gets harder, and you end up replacing components that don't need replacing!