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STARTUP PROBLEM NO DISPLAY

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October 26, 2010 1:41:06 PM

my pc
is creating some starting problm it is not working propely ONLY FAN IS RUNNING,NO DISPLAY,THE PROCESSOR LIGHT(RED LIGHT)is not blinking.....
even a month before i upgrade it with 2GB RAM(simmtronics)
plss help...........
is there is prblm in new RAM or???
a b à CPUs
October 29, 2010 6:24:27 PM

test with one stick of ram at a time in the computer.
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a b à CPUs
October 29, 2010 8:15:12 PM

Please list all of the hardware specs.
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a c 172 à CPUs
October 29, 2010 8:24:37 PM

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 beeps 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. 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:
http://www.cwc-group.com/casp.html

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 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.
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February 24, 2013 5:38:07 AM

i have the same problem of startup and no display last two days ago.

i did problem isolation and still same problem of no display upon startup. so i didnt use my desktop for two days and settled for a slower laptop.

now after two days, my desktop CPU is running upon startup and i can use it.

what seems to be the prob? i am worried that any time this startup no display problem might happen again and compromising my data and the works im doing.

btw, this is the 2nd time that this startup no display problem occur.

thx in advance.
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a b à CPUs
February 24, 2013 2:53:29 PM

This topic has been closed by Aford10
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