Will it fit in hp prodesk 400 g4 ?

No. This is an sfx unit for use in sfx,matx,or atx (with adapter). The hp uses a special small form factor slim power supply. Unless hp offers a higher wattage supply. You are out of luck.

Will it work / fit with https://www.amazon.com/gp/product/b077rpsmys/ref=oh_aui_search_detailpage?ie=utf8&psc=1

This power supply has following dimensions: 5 inches long 4 inches wide 2.5 inches high

I don't see a light indicator when it is plugged in, does it have one or you have to guess if it is working?

There is no light indicator for this power supply model. The way to tell if power supply is turned on is if the power supply fan spins or if your computer boots up after connecting all the cables correctly.

This is a question for the manufacturer, apevia. have you considered releasing a 500 watt sfx 80 plus bronze certified psu?

They make a 600W, that is barely more expensive than the 400W model

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⚡ Power your compact rig with silent strength and style!

COMPACT POWERHOUSE - 400W output tailored for Mini ITX & Micro ATX builds
SPACE SMART DESIGN - Slim 125x100x63.5mm footprint fits tight, modern setups effortlessly
SLEEK SLEEVED CABLES - All cables sleeved for durability and clean cable management
WHISPER QUIET COOLING - 80mm thermal sensing fan keeps noise minimal and temps optimal
VERSATILE CONNECTIVITY - Supports 20+4pin, 4pin 12V, 6/8pin PCIe, SATA, Molex & Floppy connectors

The APEVIA SFX-AP400W is a 400W power supply designed for Mini ITX and Micro ATX systems, featuring an 80mm automatic thermal sensing fan for quiet cooling, fully sleeved cables for durability and neat builds, and a wide array of connectors to support diverse peripherals—all packed into a compact form factor ideal for small form factor PC enthusiasts.

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Brand	Apevia
Series	FBA_SFX-AP400WÂ
Item model number	SFX-AP400W
Item Weight	2.03 pounds
Product Dimensions	5 x 4 x 2.5 inches
Item Dimensions LxWxH	5 x 4 x 2.5 inches
Manufacturer	Apevia
ASIN	B01MEDG1PM
Is Discontinued By Manufacturer	No
Date First Available	October 11, 2016

APEVIA SFX-AP400W Mini ITX Solution / Micro ATX / SFX 400W Power Supply

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