New build won't power up, PSU's fine

savataro

Reputable
Jan 7, 2016
16
0
4,510
Hello,
I decided to build a new computer for home and bought myself a Z97 Anniversary motherboard, 2x4GB of DDR3 RAM and ordered a G3258 Pentium. While waiting for the Pentium, I decided to disassemble the old PC and put the new motherboard there. I made sure everything is nice and tight and connected (put screws, tightened them, connected 20+4 pin and the 4-pin cable on the 8-pin CPU cable slot, made sure it's the right way and all) and decided to try powering it up without a CPU to see if it works. However, nothing happened- at first, I decided it was the power button- I disconnected it and tried the screwdriver trick- nothing. Then, I thought it might be from the PSU, which is pretty old, but yet I never had problems with it- I bought a new one, nothing changed again. I thought I might've bought a bad PSU, so I tried both PSUs on the old Motherboard- it powered up! However, none of the two made the new motherboard work- I tried it with two RAM chips, then without ones- no difference, nothing will spin or light up even a bit! I read that powering up a motherboard without a CPU would make the PSU fan spin, if not something else, but in my case absolutely nothing happened, no matter what I tried... I even tried removing the motherboard from the case and trying powering it up while outside the box, but again, nothing changed... Could it be a faulty motherboard? What can/should I do? Should I wait for the CPU and THEN try the motherboard? Thanks in advance!
 

savataro

Reputable
Jan 7, 2016
16
0
4,510

Tried both PSUs with a fan that's functional. Put fan in different headers, excluding the CPU fan ones, not connecting the 4-pin connector near the CPU (the motherboard has 8 pins there, but it's clearly said in the manual it's okay to use a 4-pin connector)- no change, though... the PSUs are 350W and 500W, as the 500W one is Chinese, so I'm a bit skeptical about it, but I've never had problems with the 350W one and both seem to work on my older motherboard...I have no GPU, nothing's currently attached to the mainboard, except the PSU itself...
 
Try clearing the CMOS (unplug the power cord and remove the CMOS battery for a minute). Test again, this time without using the case power switch, but a screwdriver to short the 2 pins on the board corresponding to the case power switch. If still no go, I'd RMA the board.