Installing New Graphics Card amd Power Supply

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dazzer8361

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Joined
Dec 27, 2010
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Hi, I am trying to fit a new pwer supply and graphics card to my PC. I Have purchased a Radeon Sapphire HD5770, 1GB GDDR5. I have also purchase a new 750w Power Supply (to replace the 300w power supply), which can connect directly to the Graphics Card.
I have removed the exixting parts and fitted the new parts as per the instructions. When I go to power up the PC starts for a second or two then switches off. If switch on again the same happens. During this very short period the fans on both the CPU on the motherboard and the powers supply spin. I have tried just powering up with just the large connector that plugs into the motherboard but the same thing happens.
I have now connected everything back up with the original power supply and graphics card and everything is OK again.
I understood that installing a higher wattage power supply would not be a problem for the motherboard as it will only draw the power that it needs.
If anyone can help to shed some light on where I am going wrong I would appreciate it.

Many Thanks, Darrell

Current Spec

OS Version: Microsoft Windows XP Home Edition, Service Pack 3, 32 bit
Processor: AMD Athlon(tm) 64 Processor 3500+, x86 Family 15 Model 79 Stepping 2
Processor Count: 1
RAM: 2046 Mb
Graphics Card: NVIDIA GeForce 8600 GT, 512 Mb
Hard Drives: C: Total - 70557 MB, Free - 1432 MB; D: Total - 5739 MB, Free - 633 MB;
Motherboard: ASUSTek Computer INC., NODUSM, 1.03, MB-1234567890
 
Joined
Dec 27, 2010
Messages
109
There's a little 4-lane power connector that goes to the motherboard along with the big one, check if you plugged that one. Sure a 750w PSU can handle your PC, so if the problem persists, you might have faulty hardware: test all of the parts, including your old video card and PSU.
 

dazzer8361

Thread Starter
Joined
Dec 27, 2010
Messages
6
Thanks for your reply. On my old power supply, along the big connector that connects to the motherboard, there is also a 4-way connector with two yellow and two black wires which connect to the ATX12VI connector on the motherboard.
My new power supply does not have this 4-way however it does have an 8-way connector which can seperate into two 4-way connectors. These have yellow and black wires also.
Do I need to use one of these connectors and plug it it to the ATX12VI as with the old power supply.
 
Joined
Dec 27, 2010
Messages
109
You gotta separate the 8-way connector, and plug any of the 4-way ones to the motherboard, yes. ;)
 
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