It just keeps rebooting with no screen at all even with an external screen - nothing. I've replaced the ram with one i have tested on another pc that works.I've removed the battery ,reset the bios (removal of cmos battery) ran the system with and without the battery (direct power) all to no avail.I've even removed the hdd to see if that will show a screen to show problems anyway i don't know whats wrong any ideas please? thanks in advance
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Re: Startup problem with Compaq Presario F500
"it just keeps rebooting with no screen at all even with an external screen"
I take it you mean that everytime you reboot you see nothing.....not that when you switch it on the computer reboots?
If it is that it just reboots all the time, it may be that the screen is not getting enough time to show anything. However, there are some viruses that stop the screen from showing too...so to check that put the hard drive in to another machine and run a full virus checker on it.
However, IF it is that the machine does not have a virus, and/or that the machine IS getting enough time to show a screen, then I am afraid it is either that the video cable is not working (the cable that connects the screen to the computer) or that the graphic card (or mother board if you dont have a separate graphic card) is at fault.
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Power down your Compaq Presario F500 notebook computer. Remove the unit's internal battery from its housing compartment. Use a screwdriver to unscrew and remove all of the screws from the
bottom panel of your Compaq Presario F500. Use your hands to lift off
the bottom panel, revealing the inside of the notebook computer. Look for the CMOS/BIOS chip: It will be located in the center of your
computer's motherboard, which is itself located in the center of the
case. Remove the small battery from its housing compartment on the CMOS/BIOS
chip. Then, press and hold the "Power" button on the laptop's case for a
few seconds. This will completely discharge all electricity from the
device. Replace the CMOS/BIOS' battery. Place the bottom panel of the notebook
computer back on and screw it back into place. Place the Compaq Presario
F500's battery back into its housing compartment and press the "Power"
button to turn it on. Your CMOS/BIOS will now be completely reset. Good luck and please let me know how you get on!!!!
Well the best thing to do is to start testing your hardware, you could have a problem with your hard drive, or your ram, or your video card, or your usb ports or cable's. You can make diagnostic cd's easily by using these free downloadable utilities: http://www.memtest86.com/download.html This utility is a classic and works great for testing the ram in your computer.
http://mikelab.kiev.ua/index_en.php?page=PROGRAMS/vmt_en This is a video card testing bootable image. If those pass, you can disable the usb ports on your computer from your bios potentially, and or crack open your computer and disconnect them if they are connected to the motherboard with cables :)
If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
That sounds like a power supply problem. That would be the first thing I would check. If it was the processor, you would have heard a long beeping sound or if it was the memory you would hear about three 'annoying beeps'. The main reason you indicated there is no display on the screen and that the fan spins for a few seconds then shuts off, would hint that power is not going to the mother board long enough to spin the processor or cooling fan. Hope this helps :)
I would assume that your hard drive is spinning? If not your system will not boot because of a faulty or missing harddrive. Last known good config only works on the operating system and would not work during POST. Can you give a little more information please?
Please verify the capacity and how many memory modules you have in the system?
If your system won't turn on and get 2 beeping sounds. It is an issue with your memory (RAM) you may need to reseat the memory card. After reseating the memory card (RAM) and the issue persist and i suggest to check also the warranty of your system from your coomputer manufacturer for part replacement.
It's possible the power cord is defective only giving enough power for a partial boot. I would try another power cord.
If it's not the powercord then it would definitely be the motherboard not taking the power and distributing it correctly and you would have to replace it.