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Power LED flashes Red four times, once every second, followed by a two second pause, and the computer beeps

four times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause Solution

Power failure (power supply is overloaded). 1. If equipped with a voltage selector, check that the

voltage selector, located on the rear of the power supply

(some models), is set to the appropriate voltage. Proper

voltage setting depends on your region.

2. Open the access panel and ensure the power supply

cable is seated into the connector on the system board.

3. Check if a device is causing the problem by removing

ALL attached devices (such as hard drives or optical

drives and expansion cards). Power on the system. If

the system enters POST, then power off and replace

one device at a time and repeat this procedure until

failure occurs. Replace the device that is causing the

failure. Continue adding devices one at a time to ensure

all devices are functioning properly.

4. Replace the power supply.

5. Replace the system board.

The incorrect external power supply adapter is being used on

the All-in One or USDT.

The power supply adapter must be at the correct power

rating and use the Smart ID technology before the system

will power up. Replace the power supply adapter with the

HP-supplied power supply adapter.

144 Chapter 8 Troubleshooting Without Diagnostics

Questions and Answers:

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Do you have a question about the HP Compaq Pro 6300 Series Small Form Factor and is the answer not in the manual?

HP Compaq Pro 6300 Series Small Form Factor Specifications

General

Form Factor	Small Form Factor
Expansion Slots	1 PCIe x16, 1 PCIe x1, 1 PCI
Processor	Intel Core i3/i5/i7
Chipset	Intel Q75 Express
Memory	Up to 32 GB DDR3-1600 SDRAM
Storage	128 GB Solid State Drive
Graphics	Integrated Intel HD Graphics
Optical Drive	DVD-ROM
Operating System	Windows 7, Windows 8, FreeDOS
USB Ports	6 USB 2.0
Ports	VGA, DisplayPort, RJ-45, Serial, PS/2, Audio in/out
Network	Integrated Intel 82579LM Gigabit Ethernet
Power Supply	240W
Dimensions	338 x 379 x 100 mm (13.3 x 14.9 x 3.9 in)
Weight	7.6 kg (16.7 lbs)
Audio	Integrated HD audio