Computer not posting

WolfHunter · September 1, 2016

Hello everyone! Recently I moved my PC into a new case. (Note: I have 2 power supplies, one being an EVGA 500 watt and the second being an EVGA 450 watt. Yes, I understand it's a bit overkill.) Whenever I try to power on the system, all the fans go crazy and it won't post. The 500 watt powers the GPU (AMD Radeon 5970) and the CPU (Intel i7 950). The 450 watt powers 2 hard drives and the motherboard. The new case I got was the Rosewill Nighthawk 117 and it came with a fan controller. I've never had this issue before and I'm not sure as to what's causing the problem. (Bonus: This is a second problem I don't know the answer to. The case has two switches on top for the fan controller. Each have the options low, medium and high. When they're in low, it's fine but when I change them to medium or high, the screen goes black, and the fans go crazy. The computer did post before in this new case, after I cable managed it, that's when problems started to happen.)

Squish4058 · September 1, 2016

I present to you, Kris`s long list of post causes, sorry for the bad wording and formatting I rushed this

Loose or partially dead cpu (they have backup tracks/traces but sometimes even backups break)
Loose or incompatible ram (with the motherboard), so yeah I found out this is a thing the hard way, Ram cards use ram modules, each motherboard list has a list of supported modules
Unstable Power supply
Unable to hand over Display control to the correct GPU, lets say for example you have integrated and discrete gpu, you only use HDMI output on your GPU card but you forget to plug in power for the gpu card, post will try and hand over to the integrated and other problems with graphics handover stuff

Faulty bios chip
Some (ANY) overlapping positive and negative tracks in anywhere, could be a disk drive or an optical drive or between the cpu and mobo, could be a piece of your watch scraped the case and fell in
Broken ram slots, swap em like hell 1 stick only 1 slot at a time
Did you forget to put the 8pin onto the top left of your board. I did once lol
Have you given the full 24 pin and not just 20 to your motherboard if it has connectors for it.
Is your CMOS battery charged and all the way in,
is your cmos jumper all the way in
check your System IO, trust me I know it sounds stupid but I have put the power led into the wrong pins on the motherboard 4 times ina row whilst knowing I did it wrong 10s ago

Too much ram for your motherboard to support, too high of a clock or too low of a frequency, check your motherboard page
Same as the above line for processor
Are any of the pins on your PCI devices scratched or overlapping, also check the same on your ram cards

Are there any cables between your motherboard and the case
Does your power supply have a 120/240v switch on the back and is it in the right place

Remove any unnessesary pcie devices, hard drives and usb sticks
Disonncect your CD drive

unplug your keyboard and mouse temporarily and try posting again

try other outputs on your GPU

P.S. IF YOU ARE NOT COMFORTABLE TOUCHING SOMETHING THEN ASK FIRST :D, I am not responsible for anything breaking from my suggestions