black screen , no light on keyboard

August 19, 2011 at 07:18:09
Specs: Windows XP
the problem starts when, I try to upgrade ram of PC , it won't fit , when I try the old one at first , it give me dos message , safe mode , or normal , ... but when select the options it won't start , so i keep restart it by pressing the button , after many times of that , it stop even starting POST , no light in monitor or keyboard when I start the computer , but the fun , is working and heard some noise , I think from hard disk ,,
what could be problem

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August 19, 2011 at 08:21:47
Tell us the make and model of your brand name computer, or if it is a generic desktop computer, the make and model, or at least the model, of your motherboard.

I'm assuming the computer and Windows were working fine before you attempted to upgrade the ram. If that's not your situation, tell us what your symptoms were before you attempted to upgrade the ram.

You must unplug the computer or otherwise switch off the AC power to the computer if you have a desktop computer, or remove the main battery and unplug the AC adapter if you have a laptop or netbook computer, BEFORE and while unplugging and plugging in ram modules. If you didn't do that at ALL times, ATX mboards are always powered in some places even when the computer is NOT running, some of the contacts in the ram slots have power, and you can easily damage the ram modules or the ram slot circuits while unplugging or plugging in the ram modules .

Not all ram modules that you might think should work in your mboard will work with it. It must be compatible with using it in your mboard's ram slots, and with the memory controller built into the main chipset, or for more recent mboards, compatible with the memory controller built into the CPU.

In the worst cases of ram incompatibility, the mboard will not boot at all, or will not fully boot, you have no video, and you usually do NOT hear any error beep or error beerp pattern from the mboard.

If you DO hear an error beep or an error beep pattern (multiple beeps), describe that - short or long, a higher or lower tone, whether they stop or are continuous.

"the problem starts when, I try to upgrade ram of PC , it won't fit "

If the ram module(s) will not go all the way down in the ram slot(s), assuming you installed it in the right direction, you are trying to use ram that will not work in your computer.
The original SDram, DDR ram, DDR2 ram, and DDR3 ram modules are all the same length but they use different voltages, different numbers of contacts, and the notches in the bottom edge of the module are in different locations and must line up with bumps in the bottom of the ram slot.

If you installed any ram module backwards in a ram slot and then tried to boot the computer, the ram module you installed backwards and the ram slot the backwards module was in are both fried instantly and neither can ever be used again. The ram module will have at least one damaged or missing contact, and the ram slot will show damage at the same contact location and there will be evidence that plastic has melted and probably black carbon deposits in the slot. You may have noticed a strong smell like that of burning plastic and possibly a puff of smoke when you attempted to boot the computer with the backwards module installed.
If you DID install a ram module backwards, you MIGHT be able to get the computer working again if you clean up the damaged ram slot - use good lighting to examine the ram slots and remove all black carbon deposits and remove any plastic that was melted and is touching more than one contact - and then install undamaged ram modules in the remaining undamaged ram slots. Note that if a contact is missing from a damaged ram module, it might be in the ram slot and need to be removed - look for a tiny gold or silver colored (the back side of it) piece of metal in the ram slot - you may need to blow out that ram slot to remove that contact .

Installing the original ram modules that worked fine previously should allow the computer and Windows to work fine, if the ram is properly seated in the ram slots, and if you did not do something that damaged one or more ram slots when you attempted to upgrade the ram.
If you're SURE you did not install any ram module backwards, try re-seating the modules.

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August 24, 2011 at 06:06:03
it is generic .. the mother board type is ATA133 .. even when I restart it with RAM out .. it won't beep ..

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August 24, 2011 at 06:12:42
and the it has been installed window .. in fact first it have showed me .. start option .. safe mod , normal ..etc

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August 24, 2011 at 07:48:20
the done little research .. the motherboard is ASRock model :GE pro-M2 ...

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August 24, 2011 at 08:09:55
and for your information .. i think , i have tried to install and uninstall the RAM while the power cable in not unplugged .. by just turn it off using buttons.. does this damage the RAM or RAM slot of motherboard

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August 24, 2011 at 08:17:52
"even when I restart it with RAM out .. it won't beep ."

See the part about installing the ram modules backwards in response 1.

If you DID do that
- you will see one or more damaged or missing contacts on the module that was backwards
- the ram slot the backwards module was in is ALSO damaged
- if you DID do that, follow the instructions after that about what to try that may allow the mboard to work again.

If you're SURE you didn't do that........

In that case, the ram cannot be causing your problem.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:

If you don't see any sign of that, the most likely thing is the power supply is failing or has failed completely

Failing power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
See response 4 in this:

If it is failing, you can usually replace it with any decent standard sized standard ATX PS with the same capacity or greater.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo PS.
See response 3 in this:

I no longer recommand Cooler Master, AOpen, or Sparkle power supplies.


If you can temporarily borrow a power supply from another system to try with your mboard, do that before you buy a power swupply.

A frequent mistake people are making these days is they have installed a video card their power supply hasn't got enough capacity to support.

Your power supply must have at least the minumum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD!)
You can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements.

If the power supply does not have enough capacity, the video card often works fine at first anyway, but the PS is overloaded 100% of the time the computer is running and the PS is damaged and will eventually fail completely.

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