Scores of PlayStation 3 users have reported problems with the console's just-released 4.45 firmware update.
Sony released the download worldwide last night and reports of users experiencing issues quickly followed.
"When I started up the PS3 Slim today, it reported that it required [an] update to 4.45 (the version that allows you to disable trophy notification during game play)," PlayStation forum member JadeTreeInWind wrote in a now 90-page thread.
"After the download and installation, the system rebooted. But after it displayed the PS3 logo, it went to the second screen (the flowing ribbon). It's supposed to display XMB next. But it never goes there."
Sony has removed mention of the update from its official firmware description page, but it had already been downloaded automatically by some PlayStation Plus users.
"I can not even shut down the system by pressing the power button. It bleeps, but the system didn't shut down," the user continued. "So I tried unplugging the power cord, and plugging in again. Still [the] same problem."
Reformatting your PlayStation 3 doesn't help either - those who've tried have reported that the console won't turn on at all afterwards.
Sony has since pulled the offending patch offline and is investigating the matter, the company told Eurogamer earlier.
"We are aware of reports that the recent PlayStation 3 system software update (version 4.45) has caused the XMB to not display on a small number of PS3 systems," a spokesperson said.
"We have temporarily taken 4.45 offline and are investigating the cause of the problem. We will announce when the system update is available for download as soon as possible. We apologise for the inconvenience."
At present, it's not clear what to do if you're one of the people whose machine appears to have been bricked by the update. Keep an eye on the relevant thread, and contact PlayStation Support if you need to.