ibm thinkpad boots up sporadically. Most of the time I get a black screen,

Lenovo Thinkpad with Win7, Gigs Ram , I press the power button, there is silence and after about ten seconds, I hear the hard drive and fan startup. There is no visible evidence that it is actually starting. it stays that way until I hold power button down and kill it. Every once in a while it will start normally. Anybody have any ideas?
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nobusConnect With a Mentor Commented:
could be a low cmos battery - test it , it should read 3 V min
or just install a new one - in most cases a CR2032
FhixerAuthor Commented:
Things I have tried so far, pulled battery with no A/C adapter pressed power button. Reset bios settings to default when I was able to boot it up. cracked it open and looked for loose cables. cmos battery connector is cracked, but still connected. didn't test to see if its dead.
First thing I would suggest is backup your data if not doing it already.  Image the drive just in the event the drive is failing.
When booting, get into the bios and look at the system monitor if any voltages, fans, temperatures to make that is not an issue.

If the system is on AC with the battery pulled, see if that makes a difference,

Make sure all cooling vents are clean, if you have compressed air, push from the opposite side to make sure there is no fine dust cover ....
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Connect an external display and check if it then always boots up. If that is the case it is probably and issue with the cable that goes from the PC to it's internal display, maybe it will show something when you change the display's angle.
The problem is definitely hardware related, either a problem with the video card or the lcd screen. Try shining a flash light on the screen, if you can see the windows logo, indicating it is booting up, but it is faint then the back light is gone on the screen. If there is no indication of any video on the screen it could be a bad screen, using an external monitor may help verify if the screen is bad. Also by moving the screen at different angles as suggested by Rindi may cause the screen video to flicker on and off, indicating a bad video cable or connection. You did mention you cracked open the case, but did you reseat the video cable? To connect a external monitor you may need to press the fn and one of the Fx keys (Fx x=1,2,3,4, 5, .... etc), it will have a picture of the monitor on the appropriate F key.   Then it will change from the laptop lcd to an external lcd.
FhixerAuthor Commented:
Replacing the cmos battery fixed the issue. Thank you Mobus.
FhixerAuthor Commented:
sorry , Nobus
no problem - glad to assist
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