Ab350m pro4 won't POST! Help please!!

2 things here:

- your SSD should go in the ULTRA M2 slot, not the lower (current) one.
- check is the power cables are all tucked in tight, i.e. there is no loose power connector.

datonyb wrote: what i cant seem to work out is even on corsair tech support website the pictures of output on the psu show three 6 pin sata and only one 8 pin which is labelled pcie & cpu/eps........quite how one outlet supplies two very different connections on the pc is a weird one is there a splitter lead i wonder

My thoughts exactly! When looking for the PSU specs I came across https://www.hardwareinsights.com/corsair-cx550m-farewell-group-design/
This PSU looks very bad design- and performance-wise.

The ATX 12V cable is fixed and comes together with the 24-pin one.

The 4+4/6+2 ought to be used if the MOBO has another 4-pin EPS, what I'm assuming. If you occupy this connector with an additional 4-pin CPU EPS, then the GPU powering is beyond me.

EDIT: typos




Edited by zlobster - 17 Dec 2017 at 5:08am

Side note: your SSD should perform better when it's installed in the first slot, as you did now. No worries there.

As you see the tweeter you've ripped from the poor old Dell is a plain 2-wire thingy. Why on Earth they hooked it to a 5-pin connector, I don't know. Must be some ancient technology from our ancestors.

According to the motherboard's manual (please check it yourself as well, p.29) you should connect the buzzer to the leftmost and rightmost pins to the top row of this header. Again, as per manual it goes like this (top row, left to right): +5V, dummy, dummy, SPEAKER. Try to connect just the 2 wires to these pins. It's really tricky, I know. Careful! Oh, and don't worry about 'polarity' too much. It should make (some) sounds either way.

Getting the beeper to work is our topmost priority. We need to know what the board is telling us! Beep codes here -> https://ddr4motherboard.com/beepcodes/ASROCK-AB350M-PRO4

Something noteworthy - sometimes front panel PC headers are not following the mobo pinouts too precisely, or the connectors themselves leave room for error when connecting them. Could you please remove everything EXCEPT for the power button (check manual). Even better - remove ALL headers and leave the pins bare.

If you have a steady hand you could try to short-circuit the correct pins with a flat screwdriver. This may sounds scary, but you're just doing what the power button does. WARNING! EXTREMELY DANGEROUS. This may lead to permanent damage to motherboard and components if you don't do it right or if you have a shaky hand. Triple-check the manual for the correct pins and get a glass of whisky to relax your shaky hands, if you ever decide to try this. If you have a spare connector and a wire cutter you can simulate the button too.

All this aims to rule out any improperly connected front panel headers.

Another thing - please check if you haven't forgotten the CMOS clear jumper in the wrong position.

BAD NEWS! GOt a speaker in and it gave me NO BEEPS! When I take the RAM out it gives me 3 beeps. Aghhhh, what to do now? Should I just start RMA'ing parts?

Edited by Seien - 20 Dec 2017 at 2:32am

zlobster wrote: Darn it! Did you follow my suggestions to the letter? I've seen somewhere around here that a guy has a similar issue when he swaps his 1080 for a 580. When he does this he can only POST when the GPU is connected to monitor via HMDI. Can you try different monitor cables/interfaces? If nothing helps, my first choice for RMA would be the darn mobo. Almost every second topic here is regarding the same model, with similar troubles. Too crazy to be coincidence, if you ask me. Fingers crossed!