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Interesting Dilemma

post #1 of 7
Thread Starter 
So, I bought a case, motherboard, and processor at a garage sale last summer and threw in some extra parts I had laying around to upgrade my gf's sorely outdated pc. It's still not much of a system, but it serves it's purpose.

The problem I'm having is that it boots up and works fine if it's been off for a while. But if it's been on (and running just fine) but we restart for some reason about half the time it won't come back on until we let it sit for a while.

Any ideas what'd cause something like that? No warning beeps or anything on the reboot. Just won't post...won't do anything. Acts like it has no power.
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post #2 of 7
Heat? Any specifics on the PC? CPU, mobo, cooling, PSU, RAM etc.?
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post #3 of 7
Is there anyway that it gets too hot, and it wont power back up until it cools down. Maybe the H/S isn't seated correctly.

Edit: Dralb, that avy keeps messing with me!
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post #4 of 7
Quote:
Originally Posted by sword44 View Post
So, I bought a case, motherboard, and processor at a garage sale last summer and threw in some extra parts I had laying around to upgrade my gf's sorely outdated pc. It's still not much of a system, but it serves it's purpose.

The problem I'm having is that it boots up and works fine if it's been off for a while. But if it's been on (and running just fine) but we restart for some reason about half the time it won't come back on until we let it sit for a while.

Any ideas what'd cause something like that? No warning beeps or anything on the reboot. Just won't post...won't do anything. Acts like it has no power.
From that detail there, I am going to say that it is a heat problem. I had an issue with a P4 a while back and thats what it did. It automatically shuts down because of the BIOS settings and then wont start up until it cools.

-I would start the computer up and run it under load for a min and then shut it down.
-Remove the CPU heatsink (not that the thermal grease is warmed up).
-Clean the CPU and cooler with paper towel or other non-lint causing material
-Use alcohol (90% or greater) to clean the CPU and then reseat it.
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post #5 of 7
Is it one of those with caps electrolytic caps all around the cpu socket. I had an epox or soyo board years ago. all the caps around the cpu socket were swollen, it would basically do the same thing, once in a while i would push and flatten the caps back out and then it would work , or boot again. i dunno take a close look at the Mb
    
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post #6 of 7
Thread Starter 
Ok, let's see what I remember...It's a PCChips Motherboard...dont' remember the exact model. A P4 1.8ghz 533Mhz FSB processor with stock cooling. Some cheap 1gb kingston DDR. A decent 400W power supply...don't remember the brand anymore.

As far as I can tell the cooling shouldn't be an issue. I've reseated the cooler with new Arctic Silver 5 and the case has enough ventilation...so I dunno what the problem could be. Unless the power supply ventilation is crappy...is it possible that could cause it? Keep in mind...the system works just fine as long as we leave it on.

Guess I'll check out the ventilation again and throw in another fan or two if necessary.
Edited by sword44 - 5/18/08 at 8:28am
My System
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Q6600 Gigabyte EP35-DS3L EVGA-8800GT 4gb DDR2 1066 
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320Gb Seagate Samsung DVD Burner Vista Home Premium x64 20-ich Acer LCD 
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Microsoft Corsair TX650W Antec 300 Logitech Mx510 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 Gigabyte EP35-DS3L EVGA-8800GT 4gb DDR2 1066 
Hard DriveOptical DriveOSMonitor
320Gb Seagate Samsung DVD Burner Vista Home Premium x64 20-ich Acer LCD 
KeyboardPowerCaseMouse
Microsoft Corsair TX650W Antec 300 Logitech Mx510 
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post #7 of 7
If you are certain it is not a heat issue then the next thing I would test would be the power supply. I have had customer's computers do pretty much the same thing with a bad PSU. Also, check the capacitors on the motherboard while you are in there. Swollen or leaking caps can do the same exact thing.
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AMD Phenom II X4 955  Gigabyte GA-MA790XT-UD4P Sapphire HD 6950 Sapphire HD 6950 
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Rasa Black CPU water block. Rasa X20 pump/res c... Windows 7 Ultimate x64 Deck Legend Fire mechanical with Cherry Black s... Cooler Master Silent Pro Gold 1200W modular PSU. 
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Cooler Master Storm Scout Logitech MX-518 Logitech Wireless headset for gaming and 100w M... 
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AMD Phenom II X4 955  Gigabyte GA-MA790XT-UD4P Sapphire HD 6950 Sapphire HD 6950 
RAMHard DriveHard DriveOptical Drive
G-Skill Mushkin Callisto Deluxe WD Black LG Supermulti 
CoolingOSKeyboardPower
Rasa Black CPU water block. Rasa X20 pump/res c... Windows 7 Ultimate x64 Deck Legend Fire mechanical with Cherry Black s... Cooler Master Silent Pro Gold 1200W modular PSU. 
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Cooler Master Storm Scout Logitech MX-518 Logitech Wireless headset for gaming and 100w M... 
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