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Windows 7: PSU went up in smoke. New PSU won't boot PC

04 Jul 2016   #1
probuddha

Win 7 Professional 64 bit
 
 
PSU went up in smoke. New PSU won't boot PC

So my 3 yr old Cooler Master 500W PSU went up in smoke today and I replaced it with a new 600 watt PSU.

I believe I have made all the connections properly and when I switch the system on, the PSU lights up, the fans work but there is no output on the monitor and even the keyboard doesn't work (pressing on CAPS key doesn't light up the LED). The green LED on the DVD RW stays lit but the tray doesn't come out

My specs are

1. Gigabyte 78LMT USB3 Mobo
2. AMD FX 4100 CPU
3. HD Radeon 5450 GPU
4. Crucial MX-100 250 Gig SSD
5. Seagate 500 GB HDD
6. Seagate 160 GB HDD
7. Corsair Vengeance 4Gig x 2 RAM
8. 600 Watt PSU (installed just today)

So far I have done the following.

1. Unplugged the cabinet and pressed the Power button for 1 min. Did nothing.

2. Took off the GPU and attached the monitor to the onboard graphics. Same results.

3. Removed the CMOS battery for over 5 mins and reattached it. Same results.

4. Removed the RAM sticks and tried one at Slots 1, 2 and 3. Same results.

5. Removed all the RAM sticks (with GPU still off the board) and powered on the system. No beeps.

6. Removed the SSD and tried attaching it externally to my laptop, but it wasn't detected. Could be a faulty SATA to USB connector. I bought it cheap from a local market.

Please advise what steps to follow next

Many thanks in advance


My System SpecsSystem Spec
.
04 Jul 2016   #2
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot
 
 

I think that with the power supply going up in smoke, you have to accept the real possibility that it took a number of other components with it, starting with the motherboard. Something that also concerns me is that your laptop cannot detect your SSD. It's possible that the damage was not confined to the motherboard considering that, and the fact that your DVD isn't working right either.

You may have lost the entire system.

Nevertheless, check all of your power cabling, and with everything unplugged try turning it on with only the motherboard plugged in and see if you get any beeps.
My System SpecsSystem Spec
04 Jul 2016   #3
Eric3742

Windows 7 x64
 
 

1 simple answer.

600W PSU is not enough for your computer as there are overload with too many component need power.
Hence, the 500W PSU go up in smoke.

Do a calculation how much PSU your need to get, as each component need certain amount of power.

You also need to get the "power surge protector" to avoid further damaged.
My System SpecsSystem Spec
.

04 Jul 2016   #4
bigmck

Windows 7 Home Premium 32-Bit - Build 7600 SP1
 
 

I changed out my PSU a while back and had a similar problem. Make sure the 24 pin cable makes a "Click" when it goes on the Motherboard. == I hate to say it but Mellon Head may have hit on something also about your Motherboard being gone, I hope not. Does your CPU fan turn, that will tell you if the Motherboard is out.
My System SpecsSystem Spec
04 Jul 2016   #5
probuddha

Win 7 Professional 64 bit
 
 

Thank you for your responses, guys.

I too was concerned about my SSD going bad, so the first thing I did after I woke up today was attach the SSD internally to my laptop and it worked like a charm. I was able to boot in without any issues.

So this rules out any issue with the SSD. Thank God for that.

One more thing I'd like to mention that when I start up the system, there seems to be no activitiy in my HDDs. The reason I know for sure is because

1. The LED on the cabinet indicating HDD activity doesn't blink.

2. The 160 GB HDD is a pretty old drive and it makes a noise the first time it starts up but now it doesn't.
My System SpecsSystem Spec
04 Jul 2016   #6
probuddha

Win 7 Professional 64 bit
 
 

Quote   Quote: Originally Posted by bigmck View Post
I changed out my PSU a while back and had a similar problem. Make sure the 24 pin cable makes a "Click" when it goes on the Motherboard. == I hate to say it but Mellon Head may have hit on something also about your Motherboard being gone, I hope not. Does your CPU fan turn, that will tell you if the Motherboard is out.
Yes, my CPU fan runs and it is connected to the CPU Fan pin on the MoBo and not powered directly by the PSU
My System SpecsSystem Spec
04 Jul 2016   #7
probuddha

Win 7 Professional 64 bit
 
 

Quote   Quote: Originally Posted by Eric3742 View Post
1 simple answer.

600W PSU is not enough for your computer as there are overload with too many component need power.
Hence, the 500W PSU go up in smoke.

Do a calculation how much PSU your need to get, as each component need certain amount of power.

You also need to get the "power surge protector" to avoid further damaged.
Thanks for your response.

I have a power surge connector (guess it's the same as spike buster) attached and the last 500W PSU ran for 3.5 yrs. I believe it wouldn't have run for so long if it was underpowered.
My System SpecsSystem Spec
04 Jul 2016   #8
RoasterMen

Windows 10 Pro 64-bit
 
 

I believe a 500W power supply can run that setup without any problems. But according to my research, that Cooler Master Thunder 500W is not a good one and hasn't passed 80 Plus certification. Even a 450W power supply (assuming it atleast passed 80 Plus certification) will power that setup.
My System SpecsSystem Spec
05 Jul 2016   #9
townsbg

Windows 7 pro 64-bit
 
 

Perhaps the new PSU is bad. Do you have another one that you can check? How to Check a Power Supply: 12 Steps (with Pictures)
My System SpecsSystem Spec
05 Jul 2016   #10
probuddha

Win 7 Professional 64 bit
 
 

I have a 3 yr old PSU from my previous unit that was just lying around in the corner. Would it be safe to attach that PSU for testing?
My System SpecsSystem Spec
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 PSU went up in smoke. New PSU won't boot PC




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