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New Build No Post No Display

Last response: in Systems
September 2, 2010 5:52:10 AM

Hey guys i just built a new computer for the first time but i'm having trouble! (who didnt see that coming right =p)... Well i plugged everything got everything mounted correctly on my ASUS M4A785-M Motherboard (so i think)... But i can NOT get it to POST or to give me any display. I have a Radeon HD 5770 graphics card and i get a "No Signal" message on my monitor.

I have already looked at your post on "do these steps before post" and i have my 4pin connector thingy plugged in as mentioned. (does the (X) over the 24 connector section mean to not plug that part in? im confused on that)
I am pretty sure that the CPU is getting power though because it is hot to the touch if i run it for a moment without my heatsink.
I've tried to put one stick of ram in with no luck of it posting as well as nothing in at all in hopes of it getting mad at me and beeping.

Additional Information:
All the Fans work Just fine. The CPU fan the chasis fan and my graphics card fan all work just dandy.

One additional problem and kudos for anyone who can help:
My DVD drive when i open it, it will open for a second and just close on me instantly (tried to eat my finger once!)

Thanks Guys

More about : build post display

September 2, 2010 6:27:42 AM

Work through our standard checklist. I mean work through, not just read over it.

Breadboard - that will help isolate any kind of case problem you might have.

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:

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:
At this point, you can sort of check the PSU. Try to borrow a known good PSU. 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.

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.

I always breadboard a new system before I install parts in the case. That way, I know I'm starting with known good (pretty much :) ) parts.