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post #1 of 26 (permalink) Old 08-14-2006, 12:00 AM Thread Starter
 
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Odd Behavior, Please Help.

My grandma has like the worst luck with computers and all she does is use it to surf the internet.

This latest event has really got me stumped though. Let me explain the behavior and maybe someone will know what's up.

First off, it's an Emachine T1440. When I power it up, the HDD light on the front just comes on solid. There's is no signal sent to the Monitor to tell it to turn on and there is no light that comes on on the keyboard. The fan on the power supply comes on, but not the fan on the processor.

I tested the hard drive by putting it as a slave drive on my own computer, it works just fine. Ran scandisk, there are no errors on the drive.

I tested the power supply going to the hard drive by unplugging it and plugging in a fan into that supply line. Works just fine.

I have seemingly ruled out the hard drive as the source of the problem. It seems to then lie somewhere on the motherboard itself. Again, no signal is going out to the monitor nor the keyboard.

Anyone have any clues? Any help would be appreciated. Just trying to save her from having to buy a new computer.

**EDIT**
I should add, I've also done the obvious like connect the computer to all my working connections, as in, I unplugged my cpu and plugged in the power cord, the monitor, the keyboard and mouse from my existing working pc into her cpu. So that also means it's not the power cord, the keyboard, the monitor or the mouse.

Last edited by smc1377; 08-14-2006 at 12:05 AM.
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post #2 of 26 (permalink) Old 08-14-2006, 12:24 AM
 
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Well it sounds like the motherboard definitely isn't powering up. Its possible that the power supply went, but its also possible that there is a problem with the board itself. The only thing thats making me think it might not be the power supply is the fact that the HDD light is coming on. The light is connected to the board so if there were no power getting to the board I don't see how it could turn on but I still wouldn't totally rule out the PS. The best thing you can do is to take it out and test it with a voltmeter before you ju8st go out and buy a new one. It is more common for a PS to go than a motherboard so I think its worth checking that first.

EDIT: If you want to rule out the PS just to be sure, heres a really good pinout of the connectors so you can check it.


Last edited by 00r/t.mopar.muscle; 08-14-2006 at 12:30 AM.
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post #3 of 26 (permalink) Old 08-14-2006, 12:28 AM
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i would have to say that it is the motherboard as well, possibly cpu not being seated properly, but not likely since you say that you swapped everything, i assumed that would mean that it was reseated, pther than that id just take everything out again and check all the cords, i had an IDE cable one time that was kinda cut/ripped/whatever you want to call it, the wiring was exposed and it cause all kinds of havok to me for a few days, i guess just shorting things out or whatever, so check your cables as well, other than that get a new motherboard


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post #4 of 26 (permalink) Old 08-14-2006, 01:05 AM
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I would put money on the powersupply unit. the portion that powers the drives is good, but the portion that supplies the mb is shot.

had this happen to one of my computers. replacedt he psu, and it worked fine

AJ
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post #5 of 26 (permalink) Old 08-14-2006, 02:37 AM
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Have you checked the fan on the processor to see if it will work? Might pull the fan blade off and clean all the dust out of the cooling fins and the blades, put a drop of oil on the shaft and stick it back in and see if it spins. If the fan has not been working for any length of time then you probably have overheated the processor chip and it is fried. Usually starts with fan quitting intermittantly ,sometimes with a little noise, and the computer randomly locks up (more than the "normal" Windows caused) and works after a restart, then fan finally quits completly and toasts the cpu from the excess heat. The HD light comes on but without the prcessor it doesn't know what to do, so all you get is a light on the HDD unit.

Last edited by lextrep; 08-14-2006 at 03:02 AM.
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post #6 of 26 (permalink) Old 08-14-2006, 03:06 AM Thread Starter
 
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The fan on the cpu does work. Maybe I should have mentioned this before.

Once I power on the cpu, the only way I can get it to power off is to unplug the power cord. When I unplug the power cord, the fan on the cpu kicks on for like a split second, just enough that it'll spin a few times round.

Again, I have already tried THREE different power cords. It's not the power cord itself.

Any idea on how to test the PSU without having to buy a whole new one?
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post #7 of 26 (permalink) Old 08-14-2006, 03:26 AM
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take 00r/t.moparmuscle's diagram andlook at the left most connector. this is the one that plugs into your m/b. unhook it, and unhook all the others so that you are not powering up the drives, and then get your handy dandy voltmeter out. check the grounds, make sure they are all continuous, then check each pin that has voltage at it and make sure the voltage readings are matching. If you got a parts computer you can check it w/ that, or yank the one out of your computer and see if it powers up. lot of labor involved, but it should get you pointed in the right direction.

another thing, you can get a cheapo PSU from newegg.com for about 20 bux. Might be just as easy to get it and try it out.

AJ
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post #8 of 26 (permalink) Old 08-14-2006, 10:58 AM
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or swap in your own psu to see if it works
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post #9 of 26 (permalink) Old 08-14-2006, 12:20 PM
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or just buy a psu at a local retailer and return it later, use it as a test.
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post #10 of 26 (permalink) Old 08-14-2006, 04:49 PM
 
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So is it unanimous that everyone thinks it's the PSU or is everyone just adding info on how to check the power from the PSU?

Now I gotta find someone with a voltmeter. Or maybe it can just be my grandma's excuse to buy a new computer and I'll just steal parts out of this computer for myself, haha.

She was looking at picking up the ACER computer on the front page of yesterday's Circuit City ad (well, front page for my zip code 66215).
post #11 of 26 (permalink) Old 08-14-2006, 04:57 PM
 
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(have you tried a different keyboard?????)

a) strip EVERYTHING out of the machine.

b) put one piece of ram back.

c) turn the machine on, if the video comes up, get into the BIOS and do a full reset.

d) if the bios doesn't come up, find the manual bios reset jumper. Pull the mobo battery out and jumper out the bios reset pins for 10 minutes or so. put the battery back and turn the machine on.

e) if the video comes on, turn the machine off and add ram and other components one piece at a time, testing with a power-up in between until you find the problem component.

f) if the video still doesn't come up and you've reset the bios as well as you can, the mobo is probably toast. Don't try swapping in a spare power supply unless you are SURE that this isn't one of those emachines that uses (like Dell used to) a non-standard pin-out on the power supply plugs.

Good news is that, if necessary, you can probably find a new/refurb'd system unit for under $300 on ebay. bad news is that a brand new non-faster machine for grandma is probably $600 or so.
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post #12 of 26 (permalink) Old 08-14-2006, 06:14 PM
 
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I'll have to try that 98-eser.

BTW, I'll hit you all up with rep later....from both screennames of mine, haha.
post #13 of 26 (permalink) Old 08-14-2006, 10:12 PM
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the emachines bios is soo limited i dont think that it will do anything, but its worth a shot
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post #14 of 26 (permalink) Old 08-15-2006, 02:54 AM Thread Starter
 
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I first tried just unplugging the computer and then taking out the battery to reset CMOS. Left it this way for about 10 minutes then tried to boot. Nothing.

I reset switched the jumper to reset the CMOS with battery in and unplugged. Nothing.

I took the battery out, unplugged then reset the jumper. Nothing.

Same old blank screen.
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post #15 of 26 (permalink) Old 08-15-2006, 02:57 AM
 
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Quote:
Originally Posted by smc1377
I first tried just unplugging the computer and then taking out the battery to reset CMOS. Left it this way for about 10 minutes then tried to boot. Nothing.

I reset switched the jumper to reset the CMOS with battery in and unplugged. Nothing.

I took the battery out, unplugged then reset the jumper. Nothing.

Same old blank screen.
Sorry to hear that. I still think its worth taking a look at the PSU though. At least that is pretty easy to test without having to buy anything.
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