Computer comes on and goes off

[gyrene81]

So if AMD can only handle 1066 I can't use 1333 or it won't post?

from everything i've been able to find, that appears to depend on the motherboard bios automatically stepping the effective memory speed down to 1066mhz at post. i've seen some amd bench mark tests that used 1333mhz memory on amd 780 chipset based boards with dual core amd cpus, like this review from 2010:

http://www.cpu-world.com/news_2010/2010050301_Athlon_II_X2_benchmarks.html

Gyrene, did you receive the memory and did it work?

no, i did not. i had been seeing some price drops on memory over the past month, so i was putting it off for a bit. seems it paid off too, that "unadvertised" sale at directron saved me enough that i was able to buy 8gb of 1066mhz ram for about the same price as 4gb of 1333mhz. with the mobo i'm buying, i will probably upgrade the cpu and memory next year once the price of the top end phenom2 black editions gets down below $100.

[BaldEagl]

I just had the same problem with my machine.  I replaced the PSU and it's running great again but since you already tried a known working PSU you're probably already pointed in the right direction.

[cattb]

running 1333 memory on a AMD CPU which will only run 1066 (ddr3)  may run 1333 memory , but run it at 1066. I have never tried my self , but guessing the outcome. This is also considering the motherboard will run the memory.(It should)

[zack1234]

I bought a GTX550 card and it caused havoc booting my pc up, bought ATI hd 6970 and it worked fine.

I cleaned all old drivers etc and GTX card still was moody.

I have a AMD Phenom quad core with 8 gig memory 64 bit op.

maybe its a card problem?

anyone want a GTX 550? its new

[cattb]

send it in under warranty

[gyrene81]

send it in under warranty

if it's been more than 30 days, he won't get his money back on it.

i've seen issues similar to zack's trying to run ati graphics cards with some versions of nvidia nforce chipsets on mobos...first time i've heard of an nvidia graphics card doing that on an amd chipset mobo. sell it in the classified ads section zack, may not get back all of what you paid for it.

[zack1234]

I will probably swap it instead i don't like selling second hand stuff

[icepac]

This issue occurs because the motherboard is not receiving the "power is good" signal from the power supply.

The reasons could range from any device plugged in causing the motherboard to go into crisis.......at which point it voltages are not proper.....the computer shuts down.

One thing to try before sending the board out is to unplug all the case to motherboard headers like the ones that go to the leds and the reset button........leaving only what is necessary to run the machine.

I say this because the reset switch resets the system by removing the motherboard's ability to see "power good" signal.......which causes the board to reset.

If you have a LED plugged into the "reset" pins or something else that causes the signal to be pulled, the computer will flash briefly but not boot.