processor or mainboard bad?

[jackwhitter]

i have an asus p5vd1-c (via pt880 pro/ultra chipset) that does not turn on. when the power button is pressed, the fans jerk as though they were just about to turn on, then nothing. using a multimeter, i can measure the voltage on the processor vrm and for that instant, the voltage goes from zero to 1.something volts (happens too fast for me to read).

when i pull the processor, the board powers up and all the fans spin, but with only the processor and NOTHING else, the board only initiates for a 1/2 second. once it initiates once, pressing the power or reset buttons does not do anything. however, after holding the power button for 4+ seconds (normal atx force shut off), and then pressing power again, makes the fans kick for another 1/2 second as though the board was originally powered, but measuring any point on the board with my multimeter shows 0 voltage....

i've reset cmos, pulled the battery, removed power and let the system set for a couple hours and then tried again.

i have no other 775 boards or processors to try.. all else in the computer is tested as good in my amd setup.

 

[MagnusTheBrewer]

Perhaps I misread your post but, no board will power up without ram.

 

[Alopez777]

jackwhitter,

I suspect the CPU (You've been overclocking haven't u... :-0)

Disconnect the PSU from the MB and stick those multimeter leads into the end of that cable to test...... try this AT YOUR OWN RISK.

U could also go to Fry's and purchase a cheap PSU checker... for $10 bucks.

U also might be more specific on the details as the following is a bit confusing:

"when i pull the processor, the board powers up and all the fans spin, but with only the processor and NOTHING else, the board only initiates for a 1/2 second. once it initiates once, pressing the power o"

And Yes... U need at least 1 RAM Module in the MB for it to POST

While your at Fry's purchase a PSU to test in your system then return it if its not the PSU.

Check Ebay for a cheap 775 CPU

good luck

alan

 

[jackwhitter]

i have a psu tester and the psu is good. a computer will turn on and the motherboard will initiate even without ram, and it should generate post code errors. a board and a cpu only should power on and give me some post code errors, at least. whenever i try to power on the board with the cpu in it, the fans and cpu vrm's show a voltage for an instant, then everything powers back down. i was trying to say that the board does not even get to a place where posting is the problem, as the board won't even fully power the devices onboard. none of the mosfets are active... everything is ~0 volts.

with the processor out, the board provides full power for everything to spin up, but th e vrms do not show a correct voltage (not cpu logic to tell them what to do though...)

as for overclocking, i have before, but this was a stock setup. the processor can go quite high, but i was going for stability.

 

[cubby1223]

Unless you've over-volted or over-heated or abused the cpu, chances are negligable that the cpu is at fault.

 

[Captante]

Unless you really abused your cpu its unlikely to have just failed on you ... in fact out of literally 100's of PC's I've never had a cpu fail of its own accord even when I was abusing them, although I've had a couple cooked by failing psu's or from physical damage.

A motherboard is a very complex & fragile piece of equipment & I've had quite a few just die for no apparent reason on me over the years, so I would focus your attention there first unless you stumble across a super-cheap skt-775 cpu.