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Can't work out why PC won't power on

post #1 of 41
Thread Starter 
I've been building a system for my brother with a Biostar TA790GXBE board (using onboard graphics), Athlon II X4 640 CPU and 4GB DDR2. A couple of weeks ago, it just wouldn't power on anymore and I just got a brief flicker from the onboard LEDs. As the onboard power button had stopped working some time ago, I guessed that perhaps whatever had caused that (maybe a hairline crack in the board) had spread so that now the front panel header connected button was now not working either.

I tested the RAM and PSU on another PC and they were fine, so I bought another board off e-bay, a Biostar TA790GX A3+ (it's pretty much impossible to find a full-size ATX board with the same slot arrangment and onboard graphics new). I tested that with the Athlon II X4 640 and 4GB DDR3 my Dad has just taken out of his PC after I upgraded him to 8GB and it still doesn't work, with the LEDs just briefly flickering like the TA790GXBE.

So I put the Athlon II X4 in my other board and that powers up fine. I also tried connecting the PSU to that board whilst it was still in the case, as I'd previously had the PSU on the bench when I tested it and I thought there might be a small chance that something wierd was causing it not to work properly when screwed into the case, but that worked fine too. So I know all the components are fine (I need to double-check the RAM on another board but I very much doubt that's the problem).

It's possible of course that my TA790GXBE died and the replacement TA790GX A3+ that I bought is also a dud but the seller had 100% feedback so it seems unlikely but I just can't think what else it could be.
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post #2 of 41
frist Id check the ram try booting with just 1 ram in slot 1 try each stick by its self
post #3 of 41
Thread Starter 
OK I'll try that but I tested the DDR2 I was using with the TA790GXBE in another board and it was detected OK and the DDR3 I'm using now with the TA790GX A3+ just came out of my Dad's machine so should be fine.

I meant to mention I'm testing with no HDD drives or anything else connected, just the CPU and RAM.
Gaming
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Gaming
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Hard DriveCoolingOSMonitor
Samsung F4 2TB Scythe Kotetsu Windows8.1 x64 Dell U2412M & P2314T 
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MS X4 Sidewinder eVGA SuperNova G2 750W Coolermaster HAF XB A4Tech 
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post #4 of 41
thats cool if you get no beeps with all ram out its the board if you get no post in slot 1 try 2 and so on till all slots have been tested ,,but its diffently looking to bet the board as long as the 24 pin and 4 atx are plug in
post #5 of 41
Thread Starter 
I just tested the DDR3 in my other board as well and that booted fine. In fact that board even powers-up OK without any RAM installed, so I don't think it can be a RAM problem causing the Biostar boards not to power-up.

I had the RAM in slots 3&4 before and just tried it in slots 1&2 and it still doesn't work.

I'm not sure if these boards have a beeper on them though, I've certainly never heard them beep.
Gaming
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Samsung F4 2TB Scythe Kotetsu Windows8.1 x64 Dell U2412M & P2314T 
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post #6 of 41
It's not powering up at all? As in you push the power button and then nothing?

Obvious look here is at the power unit, is there any fault with it? If not, how about the power on switch and wires. Check and replace those with possible. If all that's been done or I misread something, my apologies.
Metal Gear Rex
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Metal Gear Rex
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post #7 of 41
Thread Starter 
Quote:
Originally Posted by Xerosnake90 View Post

It's not powering up at all? As in you push the power button and then nothing?
Obvious look here is at the power unit, is there any fault with it? If not, how about the power on switch and wires. Check and replace those with possible. If all that's been done or I misread something, my apologies.

Yeah, basically the on-board LEDs briefly flicker on and that's it.

I've tested the PSU on another board and it's working fine. The Biostar board has an on-board power button and I've tried with that and the case-mounted button connected to the front panel header.

It's just wierd that this replacement board I bought is doing exactly the same thing as the previous one.
Gaming
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-4670k Asus Z97-A Powercolour HD6950 2GB 16GB Corsair Vengeance DDR3 1600Mhz LP 
Hard DriveCoolingOSMonitor
Samsung F4 2TB Scythe Kotetsu Windows8.1 x64 Dell U2412M & P2314T 
KeyboardPowerCaseMouse
MS X4 Sidewinder eVGA SuperNova G2 750W Coolermaster HAF XB A4Tech 
Audio
Onboard Realtek 
  hide details  
Reply
Gaming
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-4670k Asus Z97-A Powercolour HD6950 2GB 16GB Corsair Vengeance DDR3 1600Mhz LP 
Hard DriveCoolingOSMonitor
Samsung F4 2TB Scythe Kotetsu Windows8.1 x64 Dell U2412M & P2314T 
KeyboardPowerCaseMouse
MS X4 Sidewinder eVGA SuperNova G2 750W Coolermaster HAF XB A4Tech 
Audio
Onboard Realtek 
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Reply
post #8 of 41
I think the only thing I haven't seen you talk about in this thread is your cpu. It's quite possible your CPU may be fried. Have you attempted to take the CPU out and use it on another board to make sure it runs properly?
Metal Gear Rex
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CPUMotherboardGraphicsRAM
FX-8120 Sabertooth 990fx Sapphire Radeon HD 7870 OC edition G-skill Ripjaws X 2x8gb  
Hard DriveOptical DriveCoolingOS
Seagate 1tb Blu-ray Corsair H100 - Two AP-15s Windows 7 64 bit 
MonitorPowerCase
50' HDTV 1920x1080 Corsair TX750 NZXT Phantom Black - Three 200mm fans, Four 120... 
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Metal Gear Rex
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FX-8120 Sabertooth 990fx Sapphire Radeon HD 7870 OC edition G-skill Ripjaws X 2x8gb  
Hard DriveOptical DriveCoolingOS
Seagate 1tb Blu-ray Corsair H100 - Two AP-15s Windows 7 64 bit 
MonitorPowerCase
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post #9 of 41
Quote:
Originally Posted by Xerosnake90 View Post

I think the only thing I haven't seen you talk about in this thread is your cpu. It's quite possible your CPU may be fried. Have you attempted to take the CPU out and use it on another board to make sure it runs properly?

in the first post he says that he has tried the CPu in another board
updated rig
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intel core I5 2500K ASrock Extreme 3 gen 3 Gigabyte Radeon HD7870 2GB Overclocked 16gb Gskill 1600 Ripjaw CL9 
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updated rig
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intel core I5 2500K ASrock Extreme 3 gen 3 Gigabyte Radeon HD7870 2GB Overclocked 16gb Gskill 1600 Ripjaw CL9 
Hard DriveOptical DriveCoolingOS
WD earx caviar green 2tb,WD 1tb LG dvd Corsair H70 windows 7 ulitmate 64bit 
MonitorKeyboardPowerCase
Asus VE248H 24inch LED logitech G15 ocz modxstream-pro 700w Cooler master Storm Trooper 
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post #10 of 41
its the board
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