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No post no beeps.... possible PSU?

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October 13, 2010 3:04:08 AM

I recently installed a new motherboard, processor, and ram into my old computer...... heres the specs..

AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor
ASRock M3A770DE AM3 AMD 770 ATX AMD Motherboard
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600

were the items I added.... My comp is at the folks house because my dad was helping me work on it today but the Graphics card is not great but fairly new and worked fine on my old board. I have checked everything, gone threw the checklist, standoffs were all in place, and followed my motherboard manual step by step and even swapped ram in different slots and got nothing. The only thing I can think of is the 8 pin ATX slot on the board and my PSU only has the 4 pin but It still plugged in. Also the PSU is a 450 watt and was stock on a casing I bought a few years ago and not sure if maybe that is why I can't get to post.... The cpu fan comes on and the lights on the computer come on but no post no beep... I'm just getting a black screen. Any Advice? possible bad Mobo? cpu? and I live close to a fry's electronics.... can they test the components individually and let me know? I just hate dropping 100 bucks on a new PSU if it's not necessary.... thanks for any tips

More about : post beeps psu

a c 113 B Homebuilt system
a b V Motherboard
October 13, 2010 3:11:42 AM

Read the PSU guide in my sig and then get a decent PSU. You need one, regardless of what the actual problem is.

You have done many of the items on this checklist:
http://www.tomshardware.com/forum/261145-31-perform-ste...

But have you done them all?
October 13, 2010 3:22:01 AM

Yeah.... First thing I did was go threw that list after I was having problems.... Just hate throwing money at it when I'm not sure if that's the problem.... but your right, a bigger PSU is definately needed anyway.....
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a c 113 B Homebuilt system
a b V Motherboard
October 13, 2010 3:27:41 AM

I don't know if you need a bigger one or not, but I'm pretty sure you need a better one.
October 13, 2010 4:48:12 AM

Thanks for the advice..... does the

"Antec EarthWatts 650W Continuous Power Power Supply" seem like a decent enough PSU?.... the fry's down the road has it for 99 bucks and the only reason I'm doing that is because I don't want to wait another few days from new egg or I would go that route.... I don't know much about power supplies : /
a c 113 B Homebuilt system
a b V Motherboard
October 13, 2010 4:52:31 AM

Overpriced but yes it's fine. Made by Delta and very dependable.
October 13, 2010 5:24:09 AM

I'll pick it up in the morning and give it a go...... If that does not solve the problem and I've had multiple people look at the machine (were all stumped) is it safe to say it is probably a faulty mobo or more likely the cpu? I have no way to test it because all the other computer I have around me are intel chipsets and I can't test the ddr3 ram it has because my old comp was on a ddr2 board.... sorry about all questions, I'm relatively new to this and have turned in to a crackhead over it until I get it running....
a c 122 B Homebuilt system
a c 156 V Motherboard
October 13, 2010 5:25:32 AM

Work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence or long single beeps indicate a problem with the memory.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
October 14, 2010 3:50:53 AM

I Snagged the "antec 750 earthwatt" (for a price that I would care not to talk about) from fry's... but from reviews it seems like a PSU that will last me awhile and my old one was garbage so I can deal with it..... after some trial and error it was one of the ripjaw ram cards was faulty and hopefully i can keep the one and RMA the one that doesn't work? I've never sent anything back to newegg and wasn't sure how painful it's gonna be?? : / ..... thank you for the help, it was much appreciated, I got threw the process and couldn't be happier (other than the DOA ram card) but it happens..... my minor computer upgrade turned into everything but my casing : / ..... which I'm now tossing an eyebrow at considering some of the new one's i looked at today :p  ...... Thx again and enjoyed the process
a c 113 B Homebuilt system
a b V Motherboard
October 14, 2010 4:26:27 AM

Glad you got it all straightened out. I wouldn't have given the EA750 quite the recommendation as the EA650, but it's a good PSU.

Newegg handles the RMAs well. G.skill is OK but slower of course.
!