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Help! Homebuild won't turn on!

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May 26, 2009 9:59:58 PM

Hey guys, i just put togeather a computer with these components:

Sapphire Radeon HD 4870 1GB GDDR5 PCI-E 2XDVI-I HDCP HDTV Out Video Card

G.SKILL F2-8500CL5D-4GBPK PC2-8500 4GB 2X2GB DDR2-1066 CL5-5-5-15 240PIN Dual Channel Memory Kit

Amd Phenom Ii X4 940 Black Edition Quad Core Processor AM2+ 3.0GHZ 8MB Cache 125W 45NM Retail Box

Corsair TX750W 750W ATX 12V 60A 24PIN ATX Power Supply Active PFC 140MM Fan

Gigabyte MA790GP-UD4H AMD790GX ATX AM2+/AM3 Sideport 2PCI-E Sound GBLAN HDMI CrossFireX Motherboard

Antec Three Hundred Mini Tower Gaming Case 300 Atx 3X5.25 6X3.5INT No Ps Front Usb & Audio

Western Digital Caviar SE16 640GB SATA2 7200RPM 16MB Hard Drive Oem 3YR Mfr Warrant

Xigmatek HDT-S1283 Direct Touch 3 Heatpipe Heatsink AM2 LGA775 S754 S939 S940 W 120MM PWM Fan


When i turn on the computer all fans (including the GPU) except for the CPU's fan turn on. My monitor's light simply blinks, no beeps, no whirring, nothing. Any ideas?

More about : homebuild turn

May 26, 2009 10:10:23 PM

Nice rig

check that the processor is seated right

Do u have and AM2+ cooler or just AM2?
that might be the problem
May 26, 2009 10:22:14 PM

The Xigmatek cooler works with am2+ according to websites and stuff; i'll check out the cpu, maybe i improperly placed it... doubt it though.
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May 26, 2009 10:40:55 PM

Oh whops, thanks Shortstuff, I overlooked that - i'll read it now.

Tried the cpu; nada.
May 26, 2009 10:43:10 PM

Soundls like you missed the CPU 2x2 or 4x4 power pin from cpu to motherboard.
May 26, 2009 11:27:36 PM

From the sticky i did learn that i did not connect the 2X4, but now have; unfortunately it still does not work.

Also from the Mobo's book, it says that "The power connectors are compatible with power supplies with 2x2 12V and 2X10 power Connectors. When using a power supply providing a 2X4 12V and a 2X12 power connector, REMOVE THE PROTECTIVE COVERS FROM THE 12V POWER CONNECTOR AND THE MAIN POWER CONNECTOR ON THE MOTHERBOARD. do not insert the power supply cables into pins under the protective covers when using a power supply providing a 2x2 12V and a 2X10 power connector.


I have no idea what a protective cover is and whether or not my mobo has them on or not. My PSU is 2X4 12V and 2X12.

Any ideas?
May 26, 2009 11:43:49 PM

Reseat the power on the mobo your cpu fan should pull right off the mobo correct??If your not getting power on that it may be the cables or the mobo.
May 26, 2009 11:44:06 PM

I should read the whole post.
May 26, 2009 11:59:04 PM

MOBO's have beeper devices (little sound devices) build inside of them right? Need to be sure before i start a breadboard.
May 27, 2009 12:04:12 AM

reset the cmos now theat you got all the power plugged in.
a c 122 B Homebuilt system
May 27, 2009 1:05:55 AM

Kore said:
MOBO's have beeper devices (little sound devices) build inside of them right? Need to be sure before i start a breadboard.

Some motherboards do. Most cases do. Antec cases, for example, do not. If you have a system that is not booting, you desperately need one of these things.
May 27, 2009 3:36:45 AM

Reseting CMOS seems to have completely fixed all of my problems... though for some reason my cpu fan still isnt working! =P any suggestions? Thanks again guys!
a b B Homebuilt system
May 27, 2009 4:12:21 PM

CPU fan not working? check two things: is it plugged into the CORRECT mobo socket? And, it is plugged in the right way? Usually there is a 3-pin connector on the fan cord and a matching set of pins on mobo. Usually also you cannot plug it in with the connector reversed, but look closely anyway. If the mobo socket or fan connector is 4-pin and they don't match, look up the mobo and fan makers' websites to see how to handle that.

If these still don't help, you could try examining the BIOS Setup screesn to be sure the CPU Fan control system has the fan Enabled. You may have to hurry, though. Once you turn on the system with no CPU fan running, it won;'t take long for the CPU heat to raise the heatsink temp enough to cause the CPU protection system to shut you down. Then you will need to wait a while for it to cool off. Alternatively, see if you can rig a temporary cooler - maybe a pistol-grip hair dryer set on No Heat and blowing over the CPU heatsink.
!