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Question posted by kenwSolmi on May 10th, 2014

Hp Compaq Dc7900 Convertible Minitower Beeps 4 Times Wont Turn On

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Answer #1: Posted by freginold on May 10th, 2014 12:30 PM
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freginold

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Hi, typically when a desktop computer won't turn on, it's one of two things: the power supply unit or themotherboard (assuming you've ruled out the power coming from the wall or surge protector).

Power supplies are generally not terribly expensive. If you're not getting any power at all, the power supply is a likely culprit. It's a much cheaper option to try than the motherboard.

The motherboard is expensive to replace, so if you think the motherboard is the problem (if you've tried the power supply or ruled it out as the problem) it might be cheaper to get a new computer than have the motherboard repaired or replaced.

Related HP Dc7900 Manual Pages

Hardware Reference Guide - dc7900 Series Convertible Minitower - Page 2

...registered trademarks of Microsoft Corporation in the express warranty statements accompanying such products and services. Hardware Reference Guide HP Compaq Business PC dc7900 Series Convertible Minitower First Edition (July 2008) Document part number: 490843-001 HP shall not be construed as constituting an additional warranty. © Copyright 2008 Hewlett-Packard Development Company...
Illustrated Parts & Service Map: HP Compaq dc7900 Convertible Minitower Business PC - Page 1

...4 Power supply, 365W, 85% efficient 4 Power supply, 365W 5 Front bezel * Not shown dc7900 Illustrated Parts & Service Map, CMT Chassis 450713-001 not spared 335937-001 462434-001 437799-001 ...001 449978-001 page 1 HP shall not be liable for technical or editorial errors or omissions contained herein. Illustrated Parts & Service Map HP Compaq dc7900 Convertible Minitower Business PC © 2008,...
Technical Reference Guide: HP Compaq dc7900 Series Business Desktop Computers - Page 1

... may be used by engineers, technicians, administrators, or anyone needing detailed information on the design, architecture, function, and capabilities of the HP Compaq dc7900 Series Business Desktop Computers. Technical Reference Guide HP Compaq dc7900 Series Business Desktop Computers Document Part Number: 506665-001 September 2008 This document provides information on the products covered.
Technical Reference Guide: HP Compaq dc7900 Series Business Desktop Computers - Page 2

...Company. The information contained herein is protected by copyright. This document contains proprietary information that is subject to another language without notice. Technical Reference Guide HP Compaq dc7900 Series Business Desktop Computers First Edition (September 2008) Document Part Number: 506665-001 Nothing herein should be construed as constituting an additional warranty.
Technical Reference Guide: HP Compaq dc7900 Series Business Desktop Computers - Page 7

... Viewing the file requires a copy of this Guide This guide provides technical information about standard peripheral devices such as error codes and information about HP Compaq dc7900 Business PC personal computers that feature Intel processors and the Intel Q45 Express chipset. 1 Introduction 1.1 About this guide primarily describe the hardware and firmware elements and ...
Technical Reference Guide: HP Compaq dc7900 Series Business Desktop Computers - Page 17

... PCs This chapter includes the following topics: ■ Features (2.2) ■ System architecture (2.3) ■ Specifications (2.4) HP dc7900 CMT Technical Reference Guide www.hp.com 2-1 2 System Overview 2.1 Introduction The HP Compaq dc7900 Business PC personal computers (Figure 2-1) deliver an outstanding combination of the office enterprise. Based on the Intel processor with the...
Service Reference Guide: HP Compaq dc7900 Business PC - Page 19

... 2-3 Computer Setup-Storage (continued) Allows you to specify the parameters (logical cylinders, heads, and sectors per track may not exceed 63. Manually turn the computer off then on HP Compaq dc7900 Business PCs white paper at 3.0 Gpbs. If you attempt to after disabling RAID. Some drive and cable combinations may not run reliably at http...
Computer Setup (F10) Utility Guide - Page 11

... Some drive and cable combinations may not run reliably at http://www.hp.com for more advanced features of the SATA controller. NOTE: After ...turn the computer off then on USDT systems. Max eSATA Speed Allows you to specify the default values for the Multisector Transfers, Transfer Mode, and Translation Mode for maximum reliability. This is not available on HP Compaq dc7900 Business...
HP ProtectTools User Guide - Page 2

... forth in the United States and/or other countries. © Copyright 2008 Hewlett-Packard Development Company, L.P. The information contained herein is protected by copyright. HP ProtectTools User Guide HP Compaq Business PC First Edition: July 2008 Document Part Number: 491163-001 This document contains proprietary information that is subject to another language without notice.
Broadcom NetXtreme Gigabit Ethernet Plus NIC - Page 1

HP Compaq dc5850 Business PC 5 F10 Setup - HP Compaq dc7900 Business PC 6 Limitations 8 Drivers 8 Manageability Feature Enabling 9 DASH Enabling 9 ASF Enabling 11 Setting Up Initial Administrator Account for DASH 11 WebGUI 14 Connecting with the WebGUI ...
Broadcom NetXtreme Gigabit Ethernet Plus NIC - Page 4

...NetXtreme Gigabit Ethernet Plus. BIOS Requirements Update the system BIOS to at least the versions listed below to another system. System HP Compaq dc5850 Business PC HP Compaq dc5800 Business PC HP Compaq dc7800 Business PC HP Compaq dc7900 Business PC BIOS Family 786F6 786F2 786F1 786G1 Revision 2.06 1.53 2.04 1.08 4 Supported Platforms The Broadcom NetXtreme Gigabit Ethernet Plus...
Broadcom NetXtreme Gigabit Ethernet Plus NIC - Page 6

... Management Mode will change to be changed to primary management controller for DASH to DASH. The Broadcom NetXtreme Gigabit Ethernet Plus needs to be enabled. 6 HP Compaq dc7900 Business PC The current Management Controller: F10 Setup > Advanced > Manageability Devices. The current Management Mode: F10 Setup > File > System Information. Once the Broadcom NetXtreme Gigabit Ethernet...
Broadcom NetXtreme Gigabit Ethernet Plus NIC - Page 7

... close proximity, but there is displayed in this mode. Figure 4 Management Controller in control. 7 The placement of ASF, both management controllers can be in the HP Compaq dc7900 Business PC The current Management Mode: F10 Setup > File > System Information. The ME firmware version is no correlation between the Management Controller and Management Mode for...
Broadcom NetXtreme Gigabit Ethernet Plus NIC - Page 8

... dc5850 will bypass the Power-On Password as a localized wake and does not bypass the Power-On Password. Figure 5 Management Mode (DASH highlighted) in the HP Compaq dc7900 Business PC Limitations The Broadcom NetXtreme Gigabit Ethernet Plus functions very similarly between...
Installing Windows 7 Beta on HP Business Desktops - Page 6

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Using eSATA on HP Compaq dc7900 Business PCs - Page 1

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Using eSATA on HP Compaq dc7900 Business PCs - Page 2

This high performance interface has proven to eSATA (External Serial Advanced Technology Attachment) technology. Both the HP Compaq dc7900 Business PC Small Form Factor (SFF) and Convertible Minitower (CMT) form factors have full eSATA support. Benefits of eSATA There are many competing external storage device interfaces in SATA technology is to apply it ...
Using eSATA on HP Compaq dc7900 Business PCs - Page 5

... eSATA hot-plugging. Default is AHCI and eSATA hot-plug capable. For customers who do not use the pre-installed HP image, there are several scenarios for enhancing Windows Vista with the HP Compaq dc7900 Business PC has the Intel AHCI driver (iastor.sys) pre-loaded. See case #4 for using AHCI mode and eSATA hot...
vPro Setup and Configuration for the dc7900p Business PC with Intel vPro Processor Technology - Page 4

... (e.g. 0, 1, 2, ... 9). • Have at least one 7-bit ASCII non-alphanumeric character with HP Compaq dc7900 Business PCs. Examples of valid characters include: • Exclamation ! • At @ • Number #...updated individually. The HP Compaq dc7900 Business PC uses the 786G1 BIOS family. Refer to take advantage of AMT 5.0 features, make sure HP Compaq dc7900 PCs have a BIOS...
vPro Setup and Configuration for the dc7900p Business PC with Intel vPro Processor Technology - Page 27

...A self signed certificate can be re-enabled to the Hello messages within the time-out period, then the network interface that the AMT system is configured without the...used to the SCS. The amount of time is optional. Remote Configuration: Bare-Metal vs. Remote Configuration Time-outs in HP Systems The HP Compaq dc7900 Business PCs are embedded into the Hello messages sent...

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