Skip to main content

Delayed boot

When I power  on a PC the very first screen of Intel splash logo  stays there on more than 3 minutes then it boots the windows. normally this screen only take few seconds. there is no beep sound hear while booting.
I suspect some  hardware problem the PC .so while performing post test the problematic area  cause the lengthy boot.
so i did the  following procedure to  pin point the problem
  1. switch off the PC 
  2. removed hard disk ,CD ROM  and floppy connectors
  3. remved all internal USB  and front audio connection
  4. switch on the Mother board , 
  5. still problem is there
  6. Replace BIOS Battery found it is 2.7 v instead of 3 volt but it is not the culprit.
  7. Clean RAM and  and check CPU FAN ,even apply enough heat sink compound to the processor.
  8. Remove dust in the mother board with compressed air
  9. Inspect any visible burnt or damaged component in motherboard .
  10. check capacitor in the motherboard. 
  11. power on the PC still the problem is there.wait more than 3 minutes to load windows completely. 
  12. Normally during the boot some numbers and letters running in bottom right edge of splash screen which give hints about post codes.But in this case no such numbers appear.
  13. after windows loads I check the device manager and  found 4 unknown devices in the USB area.and not any USB device detected in any USB port.
  14. I suspect USB controller causing the boot delay
  15. restart computer pressing f2 and enter the bios disable USB in bios,save exit
  16. Now the computer restart and boot without any delay
  17. add a 5 port pci USB add on card in the PCI slot and tell the  customer to use that USB port,here after,
  18. This by pass surgery  save a motherboard  now the system is ok

Comments

Post a Comment

Popular posts from this blog

Transistor numbers and codes

Most transistor markings follow one of these codes: JEDEC, JIS or Pro-Electron. For ICs, look for known numbers (e.g. 741, 4001, 7400) between the prefix and the suffix. Don't confuse it with the date code. ICs typically have two numbers: The part number and the date code. 1. Joint Electron Device Engineering Council (JEDEC) These part numbers take the form: digit, letter, sequential number, [suffix] The letter is always 'N', and the first digit is 1 for diodes, 2 for transistors, 3 for four-leaded devices, and so forth. But 4N and 5N are reserved for opto-couplers. The sequential numbers run from 100 to 9999 and indicate the approximate time the device was first made. If present, a suffix could indicate various things. For example, a 2N2222A is an enhanced version of a 2N2222. It has higher gain, frequency, and voltage ratings. Always check the data sheet. Examples: 1N914 (diode), 2N2222, 2N2222A, 2N904 (transistors). NOTE: When a metal-can version of a JEDEC tra...
Post a Comment
Read more

Ring tester

 In my Electronic repair job I found normal multimeter is somewhat limited  in certain area. so special tools are needed for saving  a lot of time  Ring tester is one of this kind .helping me to check small hi Q inductors SMPS transformer, TV Deflection coils ,LOT ,line driver transformer and almost any inductor working on hi frequency.Normal multimeter can only identify a open coil ,but not a shorted windings.  I found some commercial available ring tester. but it is not available in local shops of my area.also it seems priced high. So  I decided to make a ring tester of my own. Below is the one I successfully made from the junk box components. I found it very useful. and now it is one of my best test tool collection. Two Ic's, few LED's ,one plastic container and few resistors  made this wonderful tool. If we test it with primary of SMPS transformer or LOT windings of a good one shows all its LEDs will light. depending on the inductive reactantce...
4 comments
Read more

Boot Menu Option Keys

  Below is a list of PC brands with their corresponding hotkeys for the boot menu and BIOS option. Computer Manufacturer    Type Model Boot Menu Key    BIOS Key ACER SERIES         ACER     Esc, F12, F9 Del, F2 ACER netbook AspireOne, Aspire Timeline F12 F2 ACER netbook Aspire v3, v5, v7 F12 F2 ASUS SERIES         ASUS desktop   F8 F9 ASUS laptop   ...
Post a Comment
Read more