PC won't turn on after new gpu installation. - part 1

hotsaucebg3 · Nov 9, 2015

Hello. Let me start with my system specs first.

Motherboard - ASUS M4A88TD-M EVO
RAM - Apacer 4GB (2x2) DDR3 1333 mhz
Cpu - AMD Sempron 140 (2.7ghz)
PSU - FSP Group 350 W
3.5" hdd 40GB, 2.5" hdd 120GB

I just bought an ATI HD 3870 graphics card for my computer. I had no videocard previously, only onboard gpu(ati 4250).

My PSU had no 6-pin connector for the card so i bought a converter which uses two of my 4-pin peripheral cables and merges them into a 6-pin for videocard.

After installing the new videocard, the pc just wont turn on, cant even spin the fans, nothing.
When I remove the 6-pin power cable of the videocard, the pc starts(sometimes the pc still won't start I have to unplug the power cable and plug it back on) but is beeping constantly, and nothing comes up on the display.
I have tried remove the cmos battery - nothing.
I have tried another videocard - Nvidia 8500 GT, and the PC works perfectly with it.
My PSU is 350W. The 8500GT uses 40W and the 3870 uses 105W. But I don't think my psu is too weak to power the card.

I have tried every step of this tutorial (except step 3):
http://www.tomshardware.co.uk/faq/id-1893016/post-system-boot-video-output-troubleshooting-checklist.html

Any help will be appreciated, thanks.

Guest · Nov 9, 2015

Is your PSU a "No name brand" one, because most of the time they don't have the capability to emit the advertised wattage.

Heironious · Nov 9, 2015

350 watt OEM PSU was just made for built in graphics. Any video card would be too much for it. You need a better PSU.

Edit: And like Vehiron said, it most likely is not the specified wattage. I would say more like under 300 watts. Also PSU's put out less and less wattage as they age.

Guest · Nov 9, 2015

BTW, word of advice, If you need to use molex adapters to power your system, your PSU was not designed/is not powerful enough to power it.

hotsaucebg3 · Nov 9, 2015

uhm.. yea, i think this is my psu:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817104045

Guest · Nov 9, 2015

hotsaucebg3 :

That is one sketchy ass PSU

hotsaucebg3 · Nov 9, 2015

okay, i have two more psu's

one says "fortron/source" on it - its 350w

the other is 400w - model LPE2-23, but it's length is suspiciolsly cut - it's half the length of a normal psu

also I have another computer here. Can i power my gpu from the other pc's psu?

Heironious · Nov 9, 2015

Your 3870 draws over 200 watts of power by itself under load. http://www.anandtech.com/show/2376/11 You can try to use the other PSU hooked up to just your GPU, it might work.

I personally would just buy a decent 500 watt brand name PSU. EVGA makes great PSU's and this one is only 9 dollars more than the one you have now. http://www.newegg.com/Product/Product.aspx?Item=N82E16817438016

hotsaucebg3 · Nov 9, 2015

Thanks for the answers.
I did try to power the card only with another psu, but it didnt work. The psu dont want to start when i connect the card only on it.
I guess I'm going for a new psu

EDIT pls help me in the other thread:
http://www.tomshardware.co.uk/answers/id-2857175/turn-gpu-installation-part.html

EDIT 2: Problem solved, I've connected the only one of the two 4-pin and it worked!

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PC won't turn on after new gpu installation. - part 1

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