Power Switch not working, is the Motherboard DOA?

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drewderman

Honorable
Jul 11, 2013
7
0
10,510
I'm building a new computer. The power switch is not doing anything and trying to short the power switch using a screwdriver does nothing. The power supply works fine on another computer as does the case's power switch. Putting a paperclip in the power supply's 24 pin connector makes the motherboard's fans and processor fans start up. I have installed the motherboard, processor, RAM, and video card at the moment with the system fan, one case fan, 24-pin power connector, 4-pin power connector, and power switch all correctly plugged into the motherboard. The 6-pin PCI-E is plugged into the video card. Am I doing something wrong or is one of the components DOA?

Here are the critical components:

1. Motherboard - ECS B85H3-M(1.0) LGA 1150 Intel B85 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard

2. Processor - Intel Core i7-4770 Haswell 3.4GHz LGA 1150 84W Quad-Core Desktop Processor Intel HD Graphics BX80646I74770

3. RAM - Team Vulcan 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model TLD38G1600HC9DC01

4. Video Card - HIS H785F2G2M Radeon HD 7850 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
 
Solution
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pretty unlikely to be honest, the k version just means it has an unlocked multiplier, both versions have 84w TDP and are virtually identical other than the 0.1Ghz difference. also the ecs cpu support summary states its compatible with socket 1150 haswells.
Is the motherboard in the case, if so there's a small chance it may be touching (a very tiny) bit of metal somewhere.
Try powering up with just the mobo/cpu/ram/psu outside the case with nothing else attached, if it's still a no go, then personally it would be going straight back.
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Oldboy05

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Jul 6, 2013
27
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10,560
try removing all the front panel connectors, then plug in just the power connector, if still no luck try switching the polarity, 99% of the time it makes no difference but you never know.
 
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Oldboy05

Honorable
Jul 6, 2013
27
0
10,560
Yep, i figured that you may have. to be honest it sounds like you've covered all the bases, and from your description it all seems to lead to faulty power pins on the mobo, which is a new one on me, although obviously specific parts can break on the mobo whilst all the others function normally. considering everything you've done, personally at this point i would rma the board, unless anyone can shed more light.
 
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drewderman

Honorable
Jul 11, 2013
7
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10,510
The other thing I'm afraid of is that the motherboard and processor might not be compatible. When I checked the compatibility list for the ECS B85H3-M motherboard, it said that i7-4770K was supported but did not say anything about i7-4770. Would the rig behave this way if they were incompatible?
 
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Oldboy05

Honorable
Jul 6, 2013
27
0
10,560
pretty unlikely to be honest, the k version just means it has an unlocked multiplier, both versions have 84w TDP and are virtually identical other than the 0.1Ghz difference. also the ecs cpu support summary states its compatible with socket 1150 haswells.
Is the motherboard in the case, if so there's a small chance it may be touching (a very tiny) bit of metal somewhere.
Try powering up with just the mobo/cpu/ram/psu outside the case with nothing else attached, if it's still a no go, then personally it would be going straight back.
 
Upvote 0 Downvote
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