help needed quickly please

[Mal X]

my pc died last week, i fitted a new PSU and still dead, i replaced the mobo and still dead......... is it the CPU ???

when you switch on the PSU nothing lights up, no LEDs at all, the wall socket is fine.......replacing the drive makes no difference.

but the CPU looked undamaged !!!!!!!!!

i need an answer quick guys, thanks

 

[Mal X]

it's totally dead, i need to know because i need to buy a new CPU tonight.

it's like turning it on without it being plugged into the wall, i cant think of anything else that it could be, because everything else is new

and if the GPU was dead or the drive, the mobo would still have its lights on/ fans spinning......... new mobo, it must be a dead CPU

 

[Mal X]

Silly question, have you tried a differnt kettle lead? I presume you have as you changed the PSU. But a freind of mine recently sold most the components in his pc because it was playing up, it turned out to be the kettle lead...

I felt bad for him, but still lolled hard as you can imagine.

it's a new psu cable......wall plug is fine as well

 

[Mal X]

i havent tried the fans thing..........but the fans are still connected up, i dont think it's the new PSU..but if so it's 2 PSUs that are bust...

the rig is as dead as it was before i stripped it

 

[Mal X]

on the web they say if the CPU is dead it wont start at all, but it could also be the RAM/ mobo, i will buy a new CPU now and check it more when i get home, because i can always get a refund on the CPU as long as i dont use it

mobo is new.......faulty RAM and it would probably still light up or even start

 

[Mal X]

pull a stick, try it, pull another stick, but yeah, I would expect it to start.

I would expect it to start with a faulty cpu as well, as mine did...

It might well start with a faulty CPU, but mine looks dead and if it's dead the PC wont do anything, mobo?......... no it's a new mobo and if that was faulty you'd still get some power.

it's either 2 broken PSUs or a CPU, but these aren't cheap PSUs, my new one is a Seagate..i've just brought a new cpu so i'll try that, i wont De-lidd this one

thanks for your help, this is one hell of a lot of money

 

[Mal X]

ordered new CPU and mobo ( bent pins on new mobo) but wont be delivered until monday..

i've tried everything and the pc is still totally dead, both PSUs wont power anything on their own, not even the fans....but it does say on the PSUs that if there's a fault on the system it goes into automatic shutdown to prevent further damage, this makes fault finding a real sod

the original fault was :- the PC suddenly switched off in idle mode while i was watching tv, as if there was a power cut............my guess is the CPU has totally died and the PSUs wont work unless it's all working.

my guess is the original mobo is still working, but i cant test it without a cpu

 

[Mal X]

i've kept the packaging for the new PSU just in case

i still cant build rig as i had to RMA the new MOBO as well, bent pins....so i brought a new phanteks instead.

the thing is i've had the CPU for well over a year so if it blew totally, i would have thought that would have happened months ago !!

i might put the new CPU in the old mobo, because i think that still works and quickly test it without turning it on

 

[Mal X]

hi guys

it was the.....................................................CPU

I fitted the new CPU to the old mobo and it started instantly.

This is the 1st CPU that's ever blown, but i did lap and delidd it, even so that was a year ago....also, i've never lost a mobo before either, so i've just wasted 300 quid on a new PSU and MOBO

but because it was totally and utterly dead it felt like a dead PSU...then a dead mobo ( because a blue flash and bang came from the lower mobo).............finally, no damage from CPU.

 

[Mal X]

i think i'll keep the old gear for spare parts, i could actually build a spare PC !!!! because i'm only running one 970 now, i therefore have a spare gpu as well.

I WONT LAP AND DELIDD ANYMORE !!!!

 

[Mal X]

I always keep a spare GPU and PSU in case I ever need to try anything, glad you got it sorted as well.

cant you not send back the parts and get a refund on them?

no i didn't keep the boxes, too much mess in the house...plus it's only the CPU that's broken, i might get a spare CPU and lap and delidd it, not sure

but this CPU is going straight in and i'll just give it 4.4, just in case it blows again

 

[Mal X]

Having spare parts, especially the PSU comes in handy when stuff breaks down the line.

yea that was my problem, i had nothing to test the rig

 

[Mal X]

I take it back then Glad you got it sorted mate. Sucks that it cost you so much though. Better sell it all and get a haswell-E so you wont ever be tempted to delid again.

i would delidd again but i wouldn't use that new fancy silver liquid, because it's too runny and i noticed that it had leaked over the edges, only use a top quality thermal paste

 

[Mal X]

sorry

 

[Mal X]

Thats what maybe killed your old chip Mal, too much liquid metal that leaked onto the pcb?

no it leaked inside the lid, it spread out from the contact area to those line of pins that are close by........a much denser paste wont spread out.

i've also noticed that Liquid pro stuff...........on the carpet! and on the wall behind my workbench , when you compress it, it tends to spit out to the sides, because it did this really badly on the 7970 GPU cooler cover

https://www.overclockers.co.uk/showproduct.php?prodid=TH-013-CL


i would personally just make sure that the CPU has a mild overclock and a standard high quality cooler, i'd get your performance from the GPU and MOBO only, otherwise you'll loose your RMA.

finally i think the 4790 is a far better than the 4770 anyway, it uses much less power and runs cooler

 

[Mal X]

You didn't apply it like regular paste did you? It comes with a brush to spread it. When i applied it to my 4770k's die it was basically just like painting a very very thin layer of silver paint. No squishing or anything like that.

no i put it on thin, but when i removed the lid i saw fine droplets around the outside of the Die.............i also had these droplets on the 7970 GPU board as well.....plus on the Carpet/ my clothes etc.

i applied it exactly as instructed, but it could squirt out as the CPU gets hot, whatever the case its definitely no better temp wise than normal high quality compound. i noticed that it spits also if you let it drop onto the CPU from a height of only 1/2 an inch, or if you move the cotton bud too quickly, it's pretty foul stuff

i am surprised the CPU totally failed, because it was delidded at least a year ago and it never ran hot

 

[Mal X]

Delidding a CPU is it really worth it? I might have a go !! Can i use Arctic silver when pasting ?

Only delidd it if the temps are way too high and even then you're better off RMAing it .........yes any really good paste will do.

but your safest best bet is to lap the CPU so that it matches the cooler base perfectly, plus the cooler too.

my new CPU/ Megahalems are bog standard and the temps are the same as my old 4770, so there you go.

i would delidd again, but only on a cheap 2nd hand 4790, if there is such a thing !!!!