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  GPU and Motherboard HDMI 'No Signal' - weird problems 
 Date Written 
Dan W Jul 20, 2015, 10:08am EDT Report Abuse
Hi all,

New account, new nightmare! Having a right old time with my gaming PC.

System has suffered a few Blue/Black Screens over the past month, but they were nothing a quick restart wouldn't fix (should have addressed these, I know). I have had a few "Insert boot disk' issues in the past with this machine too which randomly went away.

Anyway, down to the real issue...

I used the PC in the morning the other day and then after getting home from work, I turned it back on but got no signal out of the HDMI or DVI on the mobo or the GPU. Several restarts later, the problem persists.

So I assume I can get into the BIOS, but no luck there. The machine is powering on, everything is working but am not getting a monitor signal.

I removed the GPU, no improvement. I then removed the ram and inserted just one ram stick and managed to get it to the BIOS screen. I tried putting the GPU back in, but no luck there - it powers up and the fans run but no BIOS capability, just a 'no signal'. I have tried various monitors, cables, ports etc but have come to a bit of a wall. Temps all look ok. Now it will only boot if I turn everything off, take out the one ram stick, put it back and then hold f2 to get to the BIOS on startup. Exiting the BIOS boots the PC normally.

The machine is now sitting on at home permanently for fear of losing essential working time but my lovely gtx970 and 8gig ram stick are sitting in a cardboard box...

I built this back in August of last year. Finally, here are some specs:

CPU: Intel Core i5 i5-4690K
GPU: MSI GTX 970 Twin Frozr V 4GB GDDR5 w/ Cooler Master 212
RAM: Corsair Vengeance Pro 16GB (2x8GB) DDR3 1866Mhz CL9
MOBO: Gigabyte Z97MX-Gaming 5 Intel LGA1150 Z97
POWER: Corsair CP-9020054-UK RM RM650 80 Plus Gold 650W ATX/EPS
HDD: Crucial CT512MX100SSD1 512GB MX100 (OS) & WD 1TB Caviar Blue (Storage)
CASE: Fractal Design Define R4

Totally stuck and pretty upset as I have a poorly paying job and spent a lot of savings on this guy. Anyone have any ideas?

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john albrich Aug 19, 2015, 03:57pm EDT Report Abuse
>> Re: GPU and Motherboard HDMI 'No Signal' - weird problems
There are a number of possibilities, but one generally easier to check is the PSU.
A compromised PSU can result in unpredictable symptoms, including working only under certain loads on certain power rails, and symptoms possibly changing with on-time and/or PSU internal component temperatures.

It's possible the PSU has been damaged (overload, AC mains surge/spike, etc). A "go/no-go" PSU tester might be instructive in detecting an fundamental PSU problem (e.g. low-voltage on one or more power rails). However, if the system failure is load-related then the no-load testing such as performed with a "go/no-go" tester would not be conclusive.

If you can, the simplest test would be to borrow a known-good higher-power PSU (750W) and try again...starting from the simplest configuration (all not-needed-to-boot parts removed and working your way up to full configuration.



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