I've had an HP z400 for several years. It's used every day. Since doing some upgrades it continued to run fine for a couple of months. Now it's started to power off randomly and often takes several tries to power it back up to full boot. He'll be watching youtube or playing Gerry's Mod and you hear a click and it turns off just like someone unplugged it or hit the power button. Sometimes hitting the power button just once will boot it up normally but often it takes several attempts (I press the power button, blue power light comes on immediately followed by the click and goes dark again). If it doesn't power up first try I often have to let it rest for a few minutes and then it will start. Sometimes it will not start first thing in the morning but usually happens after a random shut down. Sometimes it shuts down several times a day, sometimes will go three days before doing it.
I've tweaked the power options in Windows 10 that someone said may contribute to the problem. I thought it could be overheating so I've put new silicone gel on the heatsink and made sure there's enough. I installed a front fan to cool the case better. I tweaked the GPU card's fan with Afterburner to make sure it runs at a higher speed and put a lower min temperature. It's pretty much on constantly now.
Here are my specs. The motherboard and PSU are original. PSU is in range of the new video card:
HP Product code: VS933AV
Xeon x5690 3.47ghz
10 gig ram
Geforce GTX 960 duel fan
475W PSU
I've tweaked the power options in Windows 10 that someone said may contribute to the problem. I thought it could be overheating so I've put new silicone gel on the heatsink and made sure there's enough. I installed a front fan to cool the case better. I tweaked the GPU card's fan with Afterburner to make sure it runs at a higher speed and put a lower min temperature. It's pretty much on constantly now.
Here are my specs. The motherboard and PSU are original. PSU is in range of the new video card:
HP Product code: VS933AV
Xeon x5690 3.47ghz
10 gig ram
Geforce GTX 960 duel fan
475W PSU