5V switchable power supply for LEDs

[Dom324]

Hi all,
I'm looking for a 5V PSU for powering LEDs, but I would like to be able to turn on/off the power supply with a 5V signal.
My current setup is a standard PC PSU, from which I use a 5V standby rail to power ESP32, which is controlled wirelessly. When ESP32 receives a wireless command to turn on LEDs, it sends 5V PS_ON signal to the PC PSU, which turns on and powers LEDs.

The problem with the current setup is that the PC PSU is an old and cheap unit, and it (probably) cannot deliver/sustain enough power and it shut downs after a while. Also it coil whines.
The obvious solution is to buy a better PC PSU, but I feel like that's not ideal and would rather replicate a similar setup but with a normal 5V PSU.

My idea is a phone charger as a 5V standby for ESP32 (it would be awesome to have a 5V PSU with standby rail, but I don't think those exist?), and 2x 5V PSUs (rougly 40W each?), but I need them to be switchable on/off via a similar 5V PS_ON signal.
One idea was to switch the PSUs with relays, but I would rather have an integrated solution within the PSU. Is something like this on the market?

Why am I doing this? I don't feel comfortable having the PSU running 24/7 and LEDs being constantly under voltage, especially when I'm away.

Thanks for all suggestions

[DavidAlfa]

A brand-new basic 500W ATX psu is $13, can deliver >25A in the 12V rail, so why not just get a new one?

Or are you using that PSU for only the 5V supply?
Then better user as you say, small, low power phone changer or similar, and a beefier 5V PSU enabled by a relay.