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Power and amber on but no screen or Bios during boot up

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September 21, 2010 4:27:38 PM

Hello,
During the boot up no screen, no bios beep. but the power and amber is on. Including the fan not running.
Have done nothing with hardware install since I put new PSU almost 2 years GO.
a b à CPUs
September 21, 2010 4:39:48 PM

Sounds like a bad PSU. I would try another PSU if you have access to one.
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September 21, 2010 9:07:24 PM

d1rtyju1c3 said:
Sounds like a bad PSU. I would try another PSU if you have access to one.

I just went to check the PSU receipt, my Dynex 400 watts video card is only 14 months old and it includes a fan.
Question; I have a ASUS GE Force FX5200 with a AGP interface video card. Does this cause to fail to boot up and black screen when video card fan stopped?
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a b à CPUs
September 21, 2010 9:37:05 PM

I still think it is a power supply issue.
I am not sure what you are asking.
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September 21, 2010 11:02:02 PM

d1rtyju1c3 said:
I still think it is a power supply issue.
I am not sure what you are asking.

Ok thanks
I will have someone to use the multimeter probe to check the PSU
because that is not old PSU.
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October 2, 2010 3:56:35 AM

I was tied up out of town for a couple of days.

Tried the multimeter probe and the probe was defective.

So, as of now I am ordering a new 400 watts PSU. See if that
works or not.
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a b à CPUs
October 2, 2010 4:03:38 AM

jmo1997 said:
I just went to check the PSU receipt, my Dynex 400 watts video card is only 14 months old and it includes a fan.
Question; I have a ASUS GE Force FX5200 with a AGP interface video card. Does this cause to fail to boot up and black screen when video card fan stopped?



It is a pretty old Video card it could be the problem.
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a c 172 à CPUs
October 2, 2010 4:51:11 AM

Dynex is junk.

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.
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October 6, 2010 10:24:06 PM

You are sure a savy guy with all that knowledge.

I took my Dynex 400 wps in shop to check out the PSU and it showed no activity (dead) PSU. I ageed with JSC it is a junk DYNEX.

I put in a New brand names Thermaltake TR2 430W and I am still getting no beeps and no bios. Same result as last time.
Just the Green power light and amber light. The PSU fan is running but the other fan is not running. The 4-pin cpu is plugged in. Checked to ensure the PSU peripherals cables are connected too.

The case is ANTEC unit and I think I had a PSU ULTRA 350W for almost 4 years
before I bought the DYNEX 400W last year.

Any advise what I should do. I hate to take to computer shop.
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November 27, 2010 2:57:38 AM

jsc said:
Dynex is junk.

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.

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.


JSC,

Curious if you could assist me in a similar dept. Took a (Chaintech/Nvidia) PCI GeForce FX5200 256mb card from a Dell Dimension 2400 (2oow PSU/No AGP slot/3PCI) and am trying to reinstall it in a Dell Dimension 4600i (200w PSU/1 AGP and 3 PCI Slots) system but only get a splash screen, start up of XP Pro (while line starts to move L/R) then screen goes blank. I can log on and off system (cntrl+alt+del then shutdown. Have memorized keyboard pattern). If I then go back to my onboard video, I have to shut system down, remove GeFrc, back into bios, change to ONBOARD card and all is well until I try reinstalling at which point the same thing happens again. Yet when I reinstalled it in my 2400, no problem. Is the AGP the only card I can use as video slot?? Could the PCI slots be bad? Any ideas on this would greatly be appreciated. I tried two different drivers from Nvida site (one FX5200 other FX5200 Ultra) Thx again!!
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