Burnt plastic smell and inconsistant booting

EmmaWolve

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Dec 13, 2015
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Hey guys!
Disclaimer: I'm a complete computer noob so you'll have to be patient.... sry
So the title sums it up pretty nicely but basically I was playing some CS:GO, had a few tabs open on chrome and was listening to a stream when I smelled this burnt plastic smell. I turned my computer off and tried to check if I could pinpoint what was going on but after a few minutes the smell faded and I turned my computer back on not thinking much of that incident. About a half hour later I'd say, my screen froze and I had to reboot. I managed to reboot but once again, after a few minutes the screen froze. I tried rebooting another time and that time the computer seemed like it booted but my screen got no signal (I could hear the fans and everything). I then tried opening my case to see if there weren't any noticeable failures but nothing seemed out of the ordinary. I cleaned of all the dust and tried unplugging it but it didn't help much. Now I'm at a standstill where sometimes it boots up normally and shuts down after 5 minutes, sometimes it boots up and i can only access my bios and sometimes it boots up but nothing appears on screen. Also the smell, I think it came from the power supply not sure tho.
Thanks for the help!
 

EmmaWolve

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Dec 13, 2015
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4,510


Hum... I can't manage to boot right now but it's an Acer aspire M3450 which I haven't modified. On my PSU it says it's a LITEON PS-6301-08a
 
It should have a 300W PSU (certainly not a high quality unit). It's difficult to determine where the issue is without tools or replacement pats, but you could at least perform the paper clip test and check voltages with a DVM. Best would be to test with another known good PSU.
 

Are all voltages within specs? Buzzing proves nothing; besides the paperclip tests doesn't apply any load to the PSU. It only proves that it can power up, not that it still is fully operational. It could also be the motherboard, but you'd need to swap it to make sure. It sure is easier to test with a spare PSU or one that you borrow from a friend. I always keep an old PSU for testing purposes as it sometimes come in handy.
 

EmmaWolve

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Dec 13, 2015
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I also got my hands on a hp invent DPS-300AB-20 D PSU which is much older and probably shittier but still a different PSU should I still try it? (I think it's a 300 watt)
Also thanks for your patience, I'm probably not making this easy for you

 

EmmaWolve

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Dec 13, 2015
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4,510


Whoops didn't see your reply but yeah I'm not sure how to check the voltages out... I don't have a DMV in my possession and I wouldn't know to use one either...
 

EmmaWolve

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Dec 13, 2015
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Ok I tried with another PSU and it's the same situation, the computer starts fine but when I try to "force it" by opening a chrome tab and steam, per say, it turns off. What do you think could be the next faulty part?
 
The HP PSU is powerful enough to boot the system, but it provides less power on the 12V rails than the original PSU (though it probably still is powerful enough). Since the GPU is integrated, then the next part that could possibly be defective is the motherboard. Unfortunately you don't have a spare motherboard. Did you inspect it for bulged capacitors near the CPU area? Another possibility is a CPU that overheats and has to shutdown to protect itself. What is the CPU temperature in the BIOS?