Z68AP-D3 or PSU faulty ?

varkanoid

varkanoid

varkanoid

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I have one of those annoying faults which are hard to track in where the PC boots up, no lights on from USB keyboard or mouse (normally lights up after Beep from speaker) BIOS screen appears, CPU info shows then PC resets, and loops on and on.

I have cleared CMOS which did clear it as it went back to showing the Gigabyte logo but as the keyboard does not respond pressing TAB does nothing and it resets and loops on and on.

Thinking the mobo was faulty I took it back to supplier and they tested it with an i3 2300k and it booted and they installed windows etc.

So back to square one.

Last night tried various things, only had 1 stick of memory in, no hard drives, no pcie video card any card plugged in, same result.

Now to me its one of two things, the PSU or the USB ports dont work. The latter should be ruled out as the supplier had it working fine.

So is it the PSU ?

I am thinking this as normally I switch the PC on, after the single normal beep from the speaker the lights come on the keyboard then it posts and away you go.

It all does this but no lights on keyboard or red light on optical mouse then POST screen then reset and so on.

Keyboard and mouse works fine in my wife's laptop.

Its an Antec Truepower 750w so its pretty decent one.

Its one of those things where you dont have spares but its costly to troubleshoot. So next thing I was going to get a new PSU.

Any advice ?
 
if i've read this right then you get a post screen, and a post beep and then a restart loop and nothing from our usb devices?

How did the original supplier install windows? What k/b mouse combo did they use, usb or ps2?
 
post beep > post logo > reboot
normally its post beep > keyboard lights up > post screen (logo) then windows loads

motherboard has only mouse ps2 so they must have used keyboard usb. Have asked but not had a reply yet.
 
I had a similar problem a while ago with a dell system, it wouldn't recognise my usb keyboard and i had to use the dell keyboard that came with the computer, maybe try another keyboard.

I've just had a quick look on the gigabyte website at your mobo and the ps2 port is both purple & green so can this be used for both mouse and k/b?
 
I had a similar problem with mouse support when I first installed win7 on the same board. I have one of them MS wireless mice with the usb transmitter that sits on the desk. When I swapped the port it was plugged into the blue light came on the transmitter & it solved the problem.

I also had a reboot cycle problem but crossing the cmos pins solved that.

Cheers,
Matt.
 
no its not a keyboard issue.

bought a new PSU and installed it, same issue. Bought an ASUS P8P67 LE motherboard, installed it, dont get any beeps or display. The MEMOK! button on the motherboard used to test memory is constant lit red which means memory is not compatible with the board or recommended yet its listed in the manual. I've got 4 sticks and tried them all individually but it wont boot up.

So is it now my memory thats faulty or the CPU ? Tearing my hair out a bit.
 
all I can do is throw more money at it.

Cheapest memory I can get that states is compatible with the ASUS P8P67 is Kingston Value 2gb @ £10 I can get it local so might do that.
 
Is a dodgy CPU not the most obvious after seeing the 1st mobo run with a different cpu and a second mobo not working with the original cpu?

It's a bit unlikey that every ram stick that you have used singularly would be defunct, so that would be my current best guess.
 
shadesofgrey said:
Is a dodgy CPU not the most obvious after seeing the 1st mobo run with a different cpu and a second mobo not working with the original cpu?

It's a bit unlikey that every ram stick that you have used singularly would be defunct, so that would be my current best guess.
Click to expand...
Thats what I was thinking how can 4 pieces of ram not work.
after playing about with it more the ASUS P8P67 keeps reporting via the DRAM LED that the RAM is not working with the motherboard.
So question is does the P8P67 LE be very finicky with what type of ram it needs?
Its going to cost me £10 to buy a new stick of RAM.
To buy a new CPU that works with the motherboard is going to cost loads more that I can afford.
Cheapesp 1155 CPU I can get is either a Celeron G440 or G530 but the problem is the P8P67 LE says it only supports these in the latest BIOS. So if mine does not have the latest BIOS on then will these Celeron's work with the P8P67 LE ?
 
hmmm its vary rare a cpu dies, have you gone back to the z68ap board since, sometimes these errors need to have the power from the caps dissipated before they work again.

What volts was you running the cpu at previous to this issue?
 
I've gone back to the Z68AP and its doing the same thing again with new memory.
I've bought a G530 celeron and going to try that in the motherboard when I get chance.

If I remember right it was running at 1.35v for the 4.5ghz overclock.
However just before the PC started doing the boot loop it was actually running at stock vaults.
 
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