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Started by Sam Nixon | | 10 answers
PC Wont Boot -- No Input Signal
Hi guys, Pc was working fine this morning, shut down fine, won't boot anymore. I just get No Input Signal on my monitor.

The system is powering up fine (i think), as all fans and LED's are working perfectly, just wont transfer anything to the display.

HDMI cable/monitor have been tested with an xbox and another pc, and are working fine. I dont have a VGA around to test, but shouldn't be the cables which is the issue

I dont think its a power supply issue, as I say the led's and fans are all working, and this is a consistent problem. Nothing is being displayed, ever. Usually with power supply issues the problems are intermittent (or so i think)

I can't see why the graphics card would have broken (the HDMI is plugged in here), but just to be sure, i plugged in my old, super slow graphics card and this also didn't work (had no drivers installed, but shouldnt make a differance)

I have taken both RAMS out, switched them around, tried one at a time, in all RAM ports. Nothing helped

I also can't hear if theres any beeps when i turn the machine on. May be due to noise of fans, or the fact I have no idea what im looking for, but I can't give information on any beep codes.

No new hardware

I can only guess there's something wrong with the CPU, motherboard or BIOS?

Any help at all would be awesome!

Thanks, Sam
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October 17, 2014 11:30:53 AM

before doing anything I suggest u test ur psu on other pc to be 100% it's not the psu.

about the mobo its ur choice but that asus mobo is pritty good
October 17, 2014 11:25:00 AM

I just tried the new power supply to the mobo 24pin, and the 4pin cpu power slot. Removed everything i could (drives, disks, cards, ram) and then tried powering on.

I get the cpu fan spinning, but no mobo sounds. I guess my mobo is dead :( 

Should i go about replacing by buying the exact same model, or if there anything specific I should know about before looking for an upgrade?
October 17, 2014 11:20:38 AM


I think 2nd psu doesn't have enough power but try this with the original psu

remove rams,gpu,hdd,pci chips all other hardware.Then press power up and if u don't get any beeps then I'm sry to tell but the mobo or psu or processor is dead
October 17, 2014 11:16:27 AM

Just tried the crappy spare PSU, plugged only into the mobo. CPU fan spun for maybe 1/10th of a second then stops.

Is this a fault in the mobo, psu or cpu?
October 17, 2014 11:15:56 AM

i had the same problem,turned out to be my motherboard.went to microcenter the next day and got a replacement,booted up on first try.
October 17, 2014 11:11:58 AM

it all comes to this :
remove rams,gpu,hdd,pci chips all other hardware.Then press power up and if u don't get any beeps then I'm sry to tell but the mobo or psu or processor is dead.Good luck
October 17, 2014 11:10:29 AM

anonymous1 said:
I would swap in a known working PSU. they fail in many ways.


The current PSU is at least supplying power to the LED's, fans and also graphics card. Don't faulty PSU's simply give intermittent power? Nothing has happened to the PC since it was last used, so i can't imagine that it would just die out of nowhere, yet give power perfectly to certain parts of the system.

None the less, I have a kinda crappy 300W supply i could try
October 17, 2014 11:08:14 AM

I would swap in a known working PSU. they fail in many ways.
October 17, 2014 11:07:29 AM

ganjaker said:
just changh the rams possitions

Tried switching the RAMS, trying them one at a time, in both slots, nothing worked.
October 17, 2014 11:01:12 AM

just changh the rams possitions

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