Z240 shows no video after waking from sleep

[Haydentech]

When the Z240 wakes out of sleep mode, video no longer comes out of the video card. Occasionally it does sleep/wake correctly, but this video problem happens several times per day, and I have to kill the power and restart to get it back. Even that doesn't seem to work sometimes, and I have to let it sit for an hour or so before it decides to show video again. I've tried the supplied video card (GT210), another video card (GTX 1060), 3 different monitors, upgrade to the latest BIOS... Nothing seems to help.

This is on a freshly install Windows 10 64-bit (1903).

Are there any BIOS settings or hardware changes that might help this wake-from-sleep video issue?  Since the video doesn't even show during startup, it must be a BIOS or hardware issue.

[Grzwacz]

Greetings,

Welcome back to the forum.

I am not a HP employee.

My experience with fixing this issue is to install the latest Nvidia graphics drivers.

I am assuming you are using standard Windows power settings and the BIOS is set to defaults.

Yes, you could have an intermittent motherboard problem. Try installing the graphics card in PCIe x16 slot four on the motherboard if you have a Tower. I don't know if the SFF version has the same motherboard layout.

No Device Manager errors, current graphics card drivers, and standard Windows power settings should not produce this symptom.

Regards

[Haydentech]

I appreciate the response, but it can't be drivers.  When this computer goes into the no-video failure mode, it continues in that state for awhile even if I force the machine off and do a cold boot.  You get no BIOS messages or anything on screen, and no power to any USB devices.  So it definitely seems to be a hardware or BIOS issue, not related to Windows or drivers at all.  The lack of power to USB devices is especially odd, because that is the case even when I use the USB mouse or USB keyboard to wake up the machine to find that it's in this state.