Graphic Card only works in the morning

murzar

Distinguished
Jan 25, 2012
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So.. I've got a weird problem.

My first system was a
Pentium E5700
4gb Transcend Ram.
Asus P5g41t-mlx board
Corsair CX 430
Sapphire AMD 6770 1gb gddr5

Built a new system
Pentium 3250
Asus H81 Msc
Antec VP 450
Rest of the parts are same.

The city, Chennai faced terrible floods during the 1st week of December. The new system was bought the evening before the rains and was left unused for almost 30 days.

When I did start it in January. I noticed my graphic card wouldn't work, the system would boot but without any display. Changed my VGA cable to onboard port and I got my display (didn't bother removing my graphic card, the fan kept running).

A week later, I tried connecting the VGA cable to the card, and then it started working! Used it to play a couple of old games (Fallout 3 and Mass Effect 3) and it worked flawlessly but after I turned off my system and started it again a couple of hours later, again no display from the card.

Switched off the system for the night, tried again in the morning, and it started working. Kept the system on for the whole day (switch off at night, switch on in the morning). Did it for a week, it worked.

But even now, if the computer goes to sleep (manually and automatically), is switched off or restarted, the graphic card stops working.

Also, kept changing the graphics configuration option from auto -> PEG but it always reverts back to auto.

Right now, I've also installed the Intel drivers and using them both depending on my luck.

Don't have option to test another graphic card or test my graphic card on another system.

Could also be a mobo problem, but wouldn't explain why it'd work when it does.

Hello, advice or any kind of idea appreciated!
 

Dark Lord of Tech

Retired Moderator
The power supply = Antec VP450 also isn't compatible with Haswell sleep states.

Corsair explains it here.

When an Intel Core (i3, i5, i7) processor is idle, it goes into a sleep state that requires less power than when the CPU is active. Since the motherboard voltage regulation modules that provide power to the CPU gets their power from the power supply's +12V rail, these sleep states can dramatically reduce the load on the power supply's +12V rail.

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.

While we are still working with Intel on the details of the testing methodology they use to check PSUs for Haswell compatibility, it is already known that a power supply that uses DC to DC for the non-primary rails (the +3.3V and +5V) will not have an issue with the new low power sleep states. This is because a DC to DC buck converter is used to convert +12V to +3.3V and +5V. This means that no matter what load the CPU puts on the power supply, there will always be a load on the +12V because the +12V is required to provide power to +3.3V and +5V.

Corsair utilizes this DC to DC technology in most of their power supplies. Starting with the CX750 and CX750M and moving all of the way through the GS Series, TX and TX-M Series, the HX Series, both the AX Series Gold and AX Series Platinum, and the new AXi Series. So whatever your budget, if you choose Intel's new Haswell processor and wish to utilize the new, low power C7 sleep state,