Got the motherboard and palm rest with the power button replaced today and now everything works again. It even wakes up when opening the lid. No software changes at all. So I don't believe in this being a powercfg issue in Windows.
2 motherboards, several hours tech support and now they are sending a new machine.
The M3800 went to pot when they installed some software O2 something or the other. It won't even boot now. It was sent to depot and they replaced the hard drive and OS and sent it back saying it was fixed, nonsense is what it is. Its just sitting there waiting on its replacement.
I hope the new one works.
i think i found a way to solve it, at least for my laptop.
power options - change plan settings - change advanced power settings - sleep - allow hybrid sleep
and turn on hybrid sleep.
I guess the power button has some problem to wake up system from sleep mode, but it works for hibernate mode, by turning on hybrid sleep, every time the system is set to sleep mode, it will actually set to hibernate mode. Then the system can be woke up.
It is more like a walk around
The changed both the motherboard AND the palm rest panel with the Power button. The new motherboard also has BIOS version A08. The previous board only had BIOS A07 which is a bit strange as I can not find the A08 BIOS on Dell Support Downloads.
Started having the exact same problem about a month after receiving my Dell Precision M3800. Very frustrating. I do not use any external video cards. I would appreciate any info from anyone who has found a working solution for this.
I have had a Dell M3800 since January 2014. I use it for high-end structural engineering MathCAD modeling as well as professional-level Photoshop image development. I should say "used it" because it is now virtually dead. I have never abused the unit, but it has traveled with me to several international locations and worked really well until the last trip in February.
While on a cruise through Antarctica in February, the M3800 decided it would not come out of hibernation. I have closed the lid many times, and it came right back to life when I opened the lid...but not that time.
I tried all combinations of power button pushes and lid openings to no avail. Finally, the unit started beeping...eight beeps followed by a pause then eight more beeps, etc. It stayed that way for four days while on the ship...keeping me from getting my work done.
When I got home, the M3800 suddenly decided to start working again. I was pleasantly surprised and assumed the failure had something to do with the ship...until it happened again four weeks later. This time it did not recover after sitting idle for a few days.
The unit was just one month out of the one year warranty when it started to fail, but I initiated repair through Dell anyway. To make a long story short, Dell initially misdiagnosed the problem as a system board failure. When their contract repairman came to my office and replaced the system board, the problem was still there. The repairman came back a few days later with a new LCD screen/cover. That fixed the blank screen and beeping, but the unit would no longer charge when plugged into a power outlet. The Dell repairman came back a third time to fix the charging problem and replaced the system board again. That fixed the charging issue, but one fan no longer worked. The one that did continue to work made way more noise than both fans made before this failure.
So, not being able to bring the unit out of sleep mode may be a precursor to other major issues...as I have experienced over the past three weeks. Beware of Dell repairmen bearing system boards.