PC won`t turn on after power was cut off.

nunen · Oct 11, 2014

Hi,
so power for pc was suddenly cut off and pc wont turn on.
I managed to turn it on after plugging off all the wires, holding power button for 20 sec , plugging the power back in and pressing power button.
However, I can`t do it if I connect mouse, keyboard and LCD.

mobo: asrock z97 extreme 4
cpu: i5 4690k
psu: antec hcg 620w
gpu: sapphire R9 290
ram: corsair vengeance 4GB X2
hdd: seagate baracuda 2TB
ssd: samsung evo 840 250gb
cooing: cooler master hyper 212evo.

thanks for the help!

I just did paperclip test for psu, its working.

dickey005 · Oct 11, 2014

HI !
i think u have a problem in u r mobo .

noidea_77 · Oct 11, 2014

The paperclip test may work, but I bet, the PSU doesn't work under load. That could be a result of the power cut.

nunen · Oct 11, 2014

ok I removed my GPU and it seems to be working. Gonna check everything once again.

The system is 1 month old.

Gonna connect the rest of peripherals and see if its ok .

noidea_77 · Oct 11, 2014

nunen :

= less load on the PSU.

nunen · Oct 11, 2014

It does make sense, however, It seemed to be working just fine for a month.
Anyway, I`m happy its not mobo.

ko888 · Oct 11, 2014

The Antec HCG-620 has poor voltage regulation on the minor (i.e. +3.3V and +5V) rails. It's a discontinued model based on an older group regulated circuit design that isn't Intel Haswell compatible. With transient loads at 50% PSU load the minor rails will drop below the voltage allowed by ATX specs. Antec doesn't say that the PSU has UVP (i.e. Under Voltage Protection). A protection circuit may have been triggered so you will have to cycle the PSU's main power switch on and off to get the PSU's protection circuit to reset itself.

Try using a better quality PSU.

nunen · Oct 11, 2014

thank you for reply,
Do u have any suggestions?

Actually, I managed to start it this time with a card in.

Am I risking to damage my other components because of this PSU?

ko888 · Oct 11, 2014

If a PSU is running out of spec at any time, that isn't a good thing. You're already experiencing system instability.

What is your budget range for a new PSU?

nunen · Oct 11, 2014

up to £80

ko888 · Oct 11, 2014

nunen :

XFX Pro Series XXX Edition 650W (P1-650X-XXB9)
http://uk.pcpartpicker.com/part/evga-power-supply-120g10650xr

EVGA SuperNOVA 750 B2 (110-B2-0750-VR)
http://uk.pcpartpicker.com/part/evga-power-supply-110b20750vr

XFX Pro Series XXX Edition 750W (P1-750X-XXB9)
http://uk.pcpartpicker.com/part/xfx-power-supply-p1750xxxb9

Seasonic M12II Bronze Series 650W (SS-650AM)
http://uk.pcpartpicker.com/part/seasonic-power-supply-ss650am

XFX XTR Series 650W (P1-650B-BEFX)
http://uk.pcpartpicker.com/part/xfx-power-supply-p1650bbefx

Seasonic M12II Evo Edition-750Bronze (SS-750AM2)
http://uk.pcpartpicker.com/part/seasonic-power-supply-ss750am2

EVGA SuperNOVA 750 G2 (220-G2-0750-XR)
http://uk.pcpartpicker.com/part/evga-power-supply-220g20750xr

The EVGA SuperNOVA 750 G2 (220-G2-0750-XR) is one of the best, if not the best, 750W PSUs currently on the market.

nunen · Oct 12, 2014

ko888 :

nunen :

XFX Pro Series XXX Edition 650W (P1-650X-XXB9)
http://uk.pcpartpicker.com/part/evga-power-supply-120g10650xr

EVGA SuperNOVA 750 B2 (110-B2-0750-VR)
http://uk.pcpartpicker.com/part/evga-power-supply-110b20750vr

XFX Pro Series XXX Edition 750W (P1-750X-XXB9)
http://uk.pcpartpicker.com/part/xfx-power-supply-p1750xxxb9

Seasonic M12II Bronze Series 650W (SS-650AM)
http://uk.pcpartpicker.com/part/seasonic-power-supply-ss650am

XFX XTR Series 650W (P1-650B-BEFX)
http://uk.pcpartpicker.com/part/xfx-power-supply-p1650bbefx

Seasonic M12II Evo Edition-750Bronze (SS-750AM2)
http://uk.pcpartpicker.com/part/seasonic-power-supply-ss750am2

EVGA SuperNOVA 750 G2 (220-G2-0750-XR)
http://uk.pcpartpicker.com/part/evga-power-supply-220g20750xr

The EVGA SuperNOVA 750 G2 (220-G2-0750-XR) is one of the best, if not the best, 750W PSUs currently on the market.

Ok, I just ordered1 x EVGA SuperNOVA 750w GOLD PSU - 220-G2-0750-XR ( EVGA OTHER) -uk £68.52 each ex VAT.
Thank you for answers.

nunen · Oct 14, 2014

Hi guys,
So I got the new psu, and after changing it does not start again.
I`m confused.
the pc seemed to be working fine last 2 days.

nunen · Oct 14, 2014

OK , so i did as before took my gpu out disconnect all the wires, reconnected and somehow managed to start.
Once put back gpu and connected to LCD - nothing.
I was thinking maybe the problem is something like low bios battery or something minor.

nunen · Oct 15, 2014

I actually did almost as u described. I took gpu out disconnected all the world took then put the wires back in. Took the battery out hold for some time and put it back. It started and i have connected the rest of components. However, if I tried to connect while psu is off I got the same problem. So I did connect it when psu was on.

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