I have a DP55KG (AAE47218-403) with a Core i7 860, 8 GiB RAM.
Randomly (from a couple of times a day to every couple of weeks) it dies - completely unresponsive, and the speakers are emitting white noise (or maybe pink noise) - random hissing noise.
Holding the power switch down for 10 seconds has no effect - the power needs to be removed. (Fortunately the 600 watt Cooler Master Silent Pro power supply has a rocker switch.) It seems that it has crashed at the BIOS level.
It reboots fine, and runs for a few hours to a few weeks before doing it again. I've replaced the memory with a set from another system that I upgraded, but no change. (Memory tests (memtestx86) run for several days without any errors reported.)
Has anyone else seen this?
The BIOS is a couple of updates old, but the change logs don't mention anything that seems related.
I'm considering trying a new power supply, but that's a fair chunk of money to spend on a "maybe it's the power supply" guess. (The power supply is way over-sized - the system has a 9800GT and three disks.)
...and the BIOS event logs have nothing - although there was one spurious entry about a CPU thermal limit being exceeded a week or so ago.
"Spurious" because it's winter, and the furnace has been off for a month - the office probably hasn't been above 20º for two months. And "spurious" because that's the only "high temperature" entry in the log. If there were a thermal event for every "white noise hang", it would be time to try a new CPU cooler.