Why won't my device switch on?

For the beginning my SteamDeck booted up normally and played games normally. Later, I replaced it with a larger SSD, and it also booted up normally to play games. However, I haven't used it for more than a year, and when I wanted to use it later, I found that it couldn't boot up. No matter how I pressed it, it didn't respond, there was no backlight, and there was no sound of the fan starting up. When I plugged in the charger, the indicator light would turn white, then flash slowly for a while, then go off, and then turn red. I didn't find any relevant pattern.