You don't say what PIC it is, but if it has an MCLR pin check it is at a
logic high level. Next make sure your VDD levels are correct at the device.
Check this with a scope rather than a logic probe or multimeter.

Joe 

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of picnoob
> Sent: 02 April 2007 14:30
> To: piclist@mit.edu
> Subject: [PIC] help me plz
> 
> 
> hi, im building a clock, and last night, it was working fine. 
> but i took it apart to get some photos of the inside of it(it 
> is for a school project), and now it doesnt want to do 
> anything. my logic probe is telling me that all the IO pins 
> arent at 1 or 0, just disconnect. it is acting as if it isnt 
> executing instructions, which makes no sense, as my 
> oscilloscope tells me the 20MHz xtal is oscillating with the 
> same waveform as one on another project. i know the chip 
> works, as it performs as expected in my dev board(a velleman 
> k8048). I have tried swapping the xtal for a 4MHz one like 
> the one on the dev board, but to no effect.
> 
> please help.
> 
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