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New PC does not power up

D

danik56

Member
I built this PC about 3 month ago based on ASUS H81M-K board and it worked fine for 3 month.
we went away on vacation for a week and when returning home the PC does not power up anymore.
The power led stays on for 3 seconds and all fans seem to be running fine.
Is this a power supply gone bad ?
 
Would it help to connect an internal speaker to the MB for diagnosing this kind of problem? If the PSU is bad would the MB even produce error signal beeps ?
 
If the fan spin up but the PC doesn't boot, my bet is a motherboard issue. If you have a space PC speaker hanging around, it wouldn't hurt to hook it up to see if there are any beep codes.
 
Hooked up internal speaker and it stays silent.
can I test the PSU power levels with a standard voltmeter or only with a special tool ?
 
Disconnected all but CPU and front panel connectors and still it turned off after 3 seconds.
tried another PSU and even the power led didn't come on.
reconnected original PSU and still no power led at all and fans don't move.
so MB is fried ?
 
I had two Asus boards die an early death on me. Since switching to MSI and Gigabyte I have had no problems. Others swear by Asus hardware though.
 
danik56 said:
Disconnected all but CPU and front panel connectors and still it turned off after 3 seconds.
tried another PSU and even the power led didn't come on.
reconnected original PSU and still no power led at all and fans don't move.
so MB is fried ?
Click to expand...

Since you ruled out the PSU, then it's likely a motherboard issue.
 
I would try unplugging the PC, and removing the CMOS battery for a few minutes. Put battery back, plug it back in & try again.
 
bradly1101 said:
I had two Asus boards die an early death on me. Since switching to MSI and Gigabyte I have had no problems. Others swear by Asus hardware though.
Click to expand...

I built 2 other PCs around the same time frame as this one with Gigabyte boards and I don't even remember why I picked an ASUS for this one.
maybe entry level ASUS boards are more prone to sudden death.
If I switch to another board based on same chip-set, is it required to re-install
windows 8.1 ?
 
Take the mobo out of the case, set it on a cardboard surface, unplug everything except the CPU + RAM (and GPU if it doesn't have an IGP), and see if it powers up.

Before or after that, you could also plug in the speaker, and unplug the RAM, and see if it beeps. If it does, then that's a good sign that the CPU and mobo might be good, and the RAM may be suspect, or just need contact cleaning or re-seating.
 
OK, tried to hook it up outside the case and no dice. completely dead. only a small green led on the MB itself is lit up. shortening the power switch pins do nothing.
 
If I swap to a different MB based on B85 chip set, would Windows 8.1 startup and update drivers or I must re-install the operating system?
 
I went from a Z68 to a Z97 without reinstalling Windows. The only thing you will want to do is remove drivers for any chips that aren't on the new board, and add for those that are. Personally I removed any chip or chipset driver that was originally installed and added the ones that came with the board. If you are sticking with the same chipset, you will have even less software work to do for the swap.
 
The dead MB was H81 and I will probably go to B85. I'm assuming the drivers removal can only be done if windows manages to come up the first time I boot up the new MB.
 
danik56 said:
If I swap to a different MB based on B85 chip set, would Windows 8.1 startup and update drivers or I must re-install the operating system?
Click to expand...

You should be fine. The core drivers needed to boot are the same for all recent Intel chipsets.
 
Did Microsoft stop making you call in every time you change the MB for OEM copy of windows? I heard they used to do this but since must have stopped if you can now change MB without windows locking.
 
Loser Gamer said:
Did Microsoft stop making you call in every time you change the MB for OEM copy of windows? I heard they used to do this but since must have stopped if you can now change MB without windows locking.
Click to expand...

The OP didn't necessarily buy an OEM copy of Windows. With 8(.1) there is almost no reason to do so because the OEM copy only saves you ~$20 versus the several hundred that it used to.
 
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