HP 2504EU CD-ROM and DVD problems, If you can’t boot from a CD or DVD, If a DVD plays erratically

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Troubleshooting and Maintenance

Troubleshooting Your Notebook

If you hear a loud high-pitched whine (feedback) from the speakers

•In the Volume Control, try reducing the Master volume by selecting the speaker icon in the taskbar.

•In Volume Control, select Options > Properties, and select the microphone option for the playback settings. Then in Volume Control, make sure the microphone is muted.

CD-ROM and DVD problems

If you can’t boot from a CD or DVD

•Make sure the CD or DVD is bootable, such as the QuickRestore System Recovery CD.

•Make sure the CD-ROM/DVD drive is selected as the boot device. See the “Basic Operation” chapter in this guide to change the boot sequence.

•Restart the notebook. Select Start > Turn Off Computer > Restart.

If a DVD plays erratically

•Dirt or smudges can cause a disc to skip. Clean the disc with a soft cloth. If the disc is badly scratched, it will probably have to be replaced.

•If you’re playing the DVD on battery power, try changing the power scheme.

If you get a Region Code error when playing a DVD movie

DVDs can have regional codes embedded in the disc data. These codes prevent DVD movies from being played outside the region of the world in which they are sold. If you get a Region Code error, you are trying to play a DVD intended for a different region.

If the notebook cannot read a CD or DVD

•For a single-sided CD or DVD, make sure the disc is placed in the drive with the label facing up.

•Clean the disc.

•Wait 5 to 10 seconds after closing the tray to give the notebook time to recognize the disc.

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Contents Compaq Notebook Series Reference Guide Reference Guide Second Edition March Part Number Important Safety Information Software Product License Agreement Iv Reference GuideReference Guide Vi Reference Guide Contents Batteries and Power Management Troubleshooting and Maintenance Index Getting Started with Your Notebook Identifying Parts of the Notebook Front panel and right panel componentsCD-ROM, DVD, or other drive Universal serial bus port USB Left panel and back panel components PC Card and CardBus slot and buttons Bottom panel components Identifying Parts of the Notebook Status lights Power modeBattery status Hard drive activityIdentifying Parts of the Notebook Setting Up Your Notebook Insert the batteryConnect AC power Connect a phone line Hint Set up WindowsTurn on the notebook Basic Operation Standby -Power Default power settingsPower mode To enter this mode Function Operating Your NotebookTo reset the notebook To change the boot deviceTouchPad on-off button and indicator light To use the TouchPadTo use the function hot keys This hot key Does thisTo use the One-Touch buttons To program a One-Touch buttonThis key combination Does this To use the Windows and Applications keysTo use the ALT GR key Could stop responding and you could lose data Using CDs or DVDsTo insert or remove a CD or DVD Onto the spindleTo play DVD movies To create or copy CDsTo lock your notebook To set up password protectionSecuring Your Notebook WindowsTo attach a security cable To protect against virusesTo lock the hard drive Hard driveTo maintain your notebook Taking Care of Your NotebookTo protect your hard drive To extend the life of the display To safeguard your dataTo clean your notebook Batteries and Power Management Information that was not saved will be lost Managing Power ConsumptionHow the notebook manages power automatically Changing timeout settings and creating power schemes Unsaved data if the notebook battery runs down completelyUsing Battery Power To check battery statusTo get the most from your batteries To respond to a low-battery warningTo recharge the battery Using Battery Power Modem and Network Connections Using the Modem Your telephone line type prior to connecting your phone lineTo change your modem settings Special restrictions in certain countriesConnecting to a Local Area Network LAN To prepare for connections Making Wireless Network Connections select models onlyConnecting to an existing wireless network Creating a New Notebook-to-Notebook Network Ad Hoc Turning on communication and making a connection Purchase a license before using the wireless functionIndividual wireless functions Turning off communication and ending a connection Turning on Bluetooth communication Making Wireless Bluetooth Connections select models onlyTo turn Bluetooth communication on and off FunctionTo prepare for Bluetooth connections Turning off Bluetooth communicationSending Outlook data to another Bluetooth device OPP To send or receive files using BluetoothSharing files with another Bluetooth device FTP Add-On Devices Inserting a PC Card Connecting External DevicesConnecting PC Cards Connecting External Devices Audio ports on your notebook Audio recorderThese jacks may damage the notebook To use an external monitor Connecting an external monitorAdjusting monitor resolution and other settings Using dual display mode To connect an Ieee 1394 device select models onlyPrinting to an infrared printer Using the infrared portTo connect an infrared device select models only Transferring files through an infrared connectionTo use a port replicator select models only To dock to the port replicator Corresponding port on the port replicator is ignoredTo undock from the port replicator Back of the notebook Installing Additional RAM MemoryTo install a RAM expansion module Installing Additional RAM Memory To remove a RAM expansion module Installing Additional RAM Memory Replacing the Hard Drive To replace the hard driveTo replace the hard drive holder To prepare a new hard drive Troubleshooting and Maintenance If no sound is audible Troubleshooting Your NotebookAudio problems If sound does not recordIf you get a Region Code error when playing a DVD movie CD-ROM and DVD problemsIf you can’t boot from a CD or DVD If a DVD plays erraticallyDisplay problems Hard drive problems Heat problemsInfrared problems Keyboard and pointing device problemsIf the built-in network adapter doesn’t connect to the LAN Local area network LAN problemsIf a PS/2 scroll mouse doesn’t work If you can’t log in to Netware serversMemory problems Modem problemsIf the modem dials but doesn’t connect If the modem doesn’t dial or no dial tone is detectedIf the modem dials incorrectly If the modem isn’t detectedIf the modem connects, but transferred data is bad If the modem causes an Error messageIf the modem dials but you can’t hear it If the modem doesn’t faxPC Card Pcmcia problems Performance problemsIf the notebook turns off immediately after it turns on Power and battery problemsIf the notebook stops responding If the notebook keeps beepingIf the notebook has a short operating time If the battery does not chargeIf the Time Remaining for the battery is not correct Printing problems If a serial modem does not work properly Serial, parallel, and USB problemsIf a serial mouse doesn’t work If the serial or parallel port is not workingStartup problems Wireless problems If you have problems with wireless 802.11 communicationIf you can connect, but the network is slow If your notebook cannot detect any Bluetooth devicesIf your notebook cannot detect a certain Bluetooth device Configuring the Notebook To run the Bios Setup utilitySetting Description Default Main MenuSecurity Menu To change video memory settings using Bios Setup utility Reinstalling and Updating Software To replace a damaged QuickRestore System Recovery CDReference Information Modem Reference Conexant Command ConexantModem Reference Information G,h,i G,h +MCR ECC Commands AT* Commands +FMRRegister Function Conexant Range/units Default Code MeaningCountry or Region Rated Voltage and Current Safety InformationPower cords Battery safety Laser safetyLED safety Mercury safetyExposure to radio frequency radiation Regulatory Information Connections to Peripheral DevicesRegulatory Information Responsible Party CanadaDeclaration of Conformity U.S.A Trade nameEuropean Union Regulatory Information Japan Japan Telecommunications ApprovalNew Zealand Conexant AMC20493-KT5 Data Fax Modem PTC 211/02/071Russia International EMC Index QuickRestore System Recovery USB
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2547EA, 2552AI, 2541AH, 2543AH, 2542EA specifications

The HP 2135US is a versatile all-in-one desktop computer designed to meet the needs of home and small office users. This robust machine is particularly attractive for individuals who seek a blend of performance, aesthetics, and user-friendly features.

At the heart of the HP 2135US is its powerful Intel Core processor. This series of CPUs provides reliable performance for multitasking and productivity tasks, ensuring smooth operation whether you're working on documents, browsing the web, or streaming multimedia content. Complementing the processor is a competent amount of RAM, allowing users to run multiple applications simultaneously without experiencing slowdowns.

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Storage is another significant feature of the HP 2135US. It comes equipped with a sizeable hard drive, providing ample space for files, applications, and media libraries. Furthermore, the device offers options for solid-state drives, which enhance the system's speed and responsiveness. This blend of storage solutions ensures that users can choose configurations that best fit their needs.

Connectivity is a strong suit of the HP 2135US, as it includes a range of ports and wireless options. Multiple USB ports allow for easy connection of peripherals such as printers, keyboards, and external storage devices. Additionally, integrated Wi-Fi and Bluetooth capabilities enable seamless networking and device pairing, enhancing the overall user experience.

The integrated graphics in the HP 2135US ensures decent performance for everyday tasks and light gaming. Combined with its multimedia features, the computer serves as a capable entertainment hub for users who enjoy watching movies or playing games.

In terms of design, the HP 2135US boasts a sleek, modern aesthetic that fits well in any environment. Its compact form factor makes it space-efficient, an important consideration for users with limited workspace. The ergonomics of the design also contribute to comfortable usage over extended periods.

To sum up, the HP 2135US represents a blend of performance, connectivity, and design sophistication. Its comprehensive set of features makes it an excellent choice for users seeking an all-in-one solution for both work and play, proving itself to be a worthy addition to any modern workspace or home office setup.
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